I have two daughters who live at home with me who are both university students. They both work part-time and pay me $50 a week each for everything. (And I mean absolutely everything!) I had begun to get sick and tired of their wasteful habits! I would find half eaten muesli bars lying around, week-old uneaten fruit, discarded shampoo bottles and toothpaste tubes with enough in the base for three or four more uses, soap in the bin which still had plenty of use left in it and the list goes on! Quite frankly, I'd had enough! I told them to keep their $50 a week and instead they could buy everything for themselves (snacks, lunches, toiletries and so on). I would provide their one evening meal and that was it. I even made them buy their own toilet paper. Well after two weeks they have decided to mend their ways! They just did not realise the costs involved in running a household and admitted they had taken things for granted. I only wish I had done it much sooner, for their benefit and also mine! One daughter can only afford to give me $50 still and her older sister has increased her amount to $70. However, I think things around here are going to be very different from now on as my Sad Sallys strive to become more like Happy Hanna!

After reading The $21 Challenge, I thought I would see which other areas of my life I could apply the Challenge to.

First, I opened a separate bank account and now deposit $21 every week before I do anything else with my money. I see this as a type of retirement fund – it will be nice to see the funds in 30 years time!

My next $21 Challenge is to only put $21 worth of petrol in my car each week. I will park my car further away from where I need to go; this will save money and improve my fitness and wellbeing.

When my phone contract ends soon, I am going to challenge myself to spend no more than $21 on pre-paid phone credit each month - now that will be a challenge!

There are so many ways we can implement the $21 Challenge in our lives, thanks to Fiona and Jackie's inspirational book.

Here's a great way to save heaps of money on popcorn.
 
I buy a packet of 200 Home Brand paper bags for about $3.00 from Woolworths and a 500g bag of No Frills popcorn kernels for $1.16 from Franklins. I smear some butter in the bottom of a bag and pour in about 100g of kernels. I then seal off the top of the bag by folding it over twice.
 
I set the microwave to cook on High for about three minutes but I always listen closely because the time it takes the kernels to pop depends on how much I have placed in the bag. When the frequency of the 'pops' slows to about three to five per second, I stop the microwave and let the remaining kernels stop popping before removing the bag from the microwave and adding salt.
 
For a healthier version, I simply cut out the butter and salt. I sometimes add chilli flakes or chicken salt, however, there's lots of room to experiment with a variety of flavours. Each bag of popcorn works out to about $0.25c per serve, a huge saving on the ready-made variety at the supermarket.

Save on trips to the shops during a chocolate craving, with the most dangerous chocolate cake recipe in the world! It’s called Five Minute Chocolate Mug Cake.

Ingredients:
4 tbsp flour
4 tbsp sugar
2 tbsp cocoa
1 egg
3 tbsp milk
3 tbsp oil
3 tbsp chocolate chips (optional)
Small splash of vanilla extract

Method:
Add dry ingredients to a large coffee mug, and mix well. Add the egg and mix thoroughly. Pour in the milk and oil and mix well. Add the chocolate chips, if using them, and vanilla extract and mix again. Put your mug in the microwave and cook for three minutes at 1000 watts. The cake will rise over the top of the mug, but don't be alarmed! Allow to cool a little, and tip onto a plate if desired. This can serve two if you want to feel slightly more virtuous.

And why is this the most dangerous chocolate cake recipe in the world? Because we are now only five minutes away from chocolate cake at any time of the day or night!

Last Christmas, instead of buying everyone gifts, I bought some small gift boxes for $2.00 each at cheap stores and baked mini puddings and mini rum balls (I made heaps from one recipe), which I put in the boxes. I then tied them with a length of curling ribbon to make them look attractive. Everyone loved the goodies inside, and the maximum cost was $20 for at least six boxes.

I will definitely be doing this again this year. It will probably become a tradition - and why not?

We are saving over $600 a year on shoe deodorisers! My husband has terribly smelly feet and is very embarrassed by the problem. It was costing us approximately $12 every week to buy different shoe inserts and powders, all of which were only temporarily effective. Now it only costs us $2.00 every two months! My husband has discovered that just a few drops of waterless hand sanitiser on each foot kills all the bacteria that causes the feet to smell. It takes just a few seconds to apply and evaporates very quickly, meaning no mess on his feet, socks or the carpets. He buys the large bottles of sanitiser for only $2.00 in the bargain stores and they work brilliantly. All his shoes, including his work boots, are now completely odourless!

Making our own cleaners has saved us a fortune over the years and we have saved the environment a little too. '1001 Greener Household Hints' by John Schluter is full of simple household cleaning ideas and we went straight out and bought some five litre bottles, spray bottles and some of the suggested basic cleaning ingredients. The following instructions are from the book:

Air freshener: Mix one teaspoon of bicarbonate of soda with one tablespoon of white vinegar. Add two cups of water. Store the mixture in a pump spray bottle. Add scented oils for fragrance.

Spray and wipe cleaner: Mix two tablespoons of cloudy ammonia, a half cup of white vinegar, two tablespoons of washing-up detergent and four litres of warm water. We stored this in large labelled bottles and used in spray bottles as needed.

Bathroom disinfectant liquid: Dissolve 12 drops of eucalyptus oil in 1ml of methylated spirits and then add eight cups of warm water. We used this in spray bottles also.

We paid $5.00 for the book but have saved hundreds in the years since we began making our own cleaning products.

Through my job working at one of the major supermarkets, I have learned all kinds of tips and tricks to save money! Next time you visit a supermarket, bear the following in mind:

• You can save up to 50% on Sara Lee products by buying our house brand bakery items instead - they are made by exactly the same company.

• The meat is no longer as good quality and has gone up slightly in price. I would suggest going to a butcher instead and paying less for better quality.

• In-store baked items are marked down from 40-80% two days before their use-by date (this does not include bread or donuts)

• Buy bulk and buy less often. For example, if you drink coffee, wait until the BIG tins are on special and buy three or four. This will last you for ages and save you $40 and upwards on coffee alone in the long run!

• If an item seems a bit sparse towards the end of the week, chances are there is actually heaps out the back and it is going on special on the Monday, so wait to make your purchase then if possible.

• For those living alone, take another look at those frozen meals. They may look expensive at first glance at between $4 and $6 but then go and price the meat and all the vegetables. Remember also to take into account how much you have to throw out after a few days through not using them!

• If you want to see who makes what, look at the back of the pack to see which company owns it. Visit the Australian Stock Exchange (ASX) website and find out which other 'mini-companies' it has under its belt. They often compete with their own brands!

I moved to Perth a couple of years ago with very few possessions, two young children and a dog. I stayed with friends for a couple of weeks and really liked the area they lived in.

I set my rent limit to $150 (cheap for city living - but necessary for the budget) and put my name down on the huge waiting list for government housing. I looked at many places - most out of financial reach. The ones I could afford looked (and smelled) bad. I decided I could 'change' the appearance and the smells - but not the budget.

So, I rented the 'worst house in the best street'. I went through a real estate agent and asked if I could meet with the owner. When he came around (which most don't do regularly with managed properties), he was the first to admit the place needed work (mostly cosmetic).

I suggested to him that I would spruce the place up a bit and in return my rent would not go up while I lived there, plus we agreed that I would be entitled to two weeks rent free over Christmas!

I have painted the entire inside of the house for about $200 (including feature walls, and old laminated cupboards) by buying mis-tinted paints and laybying paint specials. I ripped up the old carpets and polished the floor boards (about $150 in equipment hire and food for my 'helpers') I also got second hand carpet for free from the local paper and replaced the old stuff in the kids bedrooms. I got curtains and blinds from the op-shop and sale tables (about $50 in total)

As for the outside - my place looks better than most of the privately owned homes now! A few boxes of lawn seed (about $3.00 from supermarkets), a bit of hand watering and weed pulling and I have a great front lawn.

I built flower beds with bulk seedlings ($0.45c per punnet from the local nursery - discontinued or 'sick' stock). People in the street are always telling me how great the house looks and they can't believe its the same place!

I work and go to university, as well as look after my children - so all this has been achieved over the last two years. My landlord is happy, we are happy and the money I save weekly in rent (between $50 - $60 per week) allows us to go on holidays once a year and have a few extras!

For a super, low-cost, personal and heartfelt gift, why not give someone a Happy Bag? All you need is a plastic 'loot bag' such as those given away at children's birthday parties, and fill with the following:

*An eraser - so that you can make your mistakes disappear.

*Five cents - so you can never say that you're broke.

*A marble - in case someone says you've lost yours.

*A rubber band - to stretch yourself beyond your limits.

*A piece of string - to tie yourself together when things fall apart.

*A bear hug (cut out teddy bear picture or motif) - to remind you that someone cares.