Power is the rate at which energy is put into, or taken out of, a system. For example, a 500 Watt halogen light uses 500 Joules of energy every second.
There are two common units of power, the Watt and the Horsepower. This page will help you to convert between them.
All you need to do is find the amount of money you get paid a month and use variable x to represent the months and then subtract that from the money you need to pay off.
