If Sally places X amount in an account, how much will she have after X years at X percent?

Finance: A branch of economics concerned with time and energy allocation and wasting time management. Involves acquiring knowledge and investing large chunks of time. Deals with matters related to my recession of fun and decline in enthusiasm.

Should I be studying for my finance test right now.........? Well, I am sure there is an equation that could predict the outcome of my test score by looking at my effort put into the class and dividing it by my not spent studying...... We could call it my "failure-to-know" ratio.......