ONLY ENTER POSITIVE NUMBERS!!! if you want to use a fraction, convert to decimal by dividing the numerator by the denominator. If a mixed number, do the same, and add the big number to it.
Compound interest is just how much you will earn over time. For example, if you make 1.2% interest from a bank account or something each set amount of time. I know it says years in the project, but it can be substituted for months, days, weeks, etc. You just need to input however many of those years, months, days, weeks etc have gone by.