Mr+Cairns'+Problem+page.

I love my wood fire. We heat our house every winter using the wood fire. A trailer load costs $85 delivered. This tonne of wood will last for 21 days. How much wood will the Cairns family use in 2009. What will the cost be?

If you are super interested in the task you could look at the cost of gas compared to the cost of wood. You would need to research gas prices. Who would you ask? Where would you find information?