Here is the directions I have for my assignment

A student of the FAU Computer Science program graduates on their birthday at age X.
They are immediately hired by a company at salary Y (after taxes). They save Z percent of their income each year in a cookie jar on top of their refrigerator. Each year, on their birthday, they add the contents of the cookie jar to their tax-deferred investment plan which returns W percent compounded annually (on their birthday).

Write a C program which reads in the values of X, Y, Z and W from the keyboard and displays on the screen how much money they have in their investment plan on every birthday up to age 95. (When they retire to a life of yachting, race car driving, and attending those wild FAU alumni parties!). At the bottom of this, display on the screen what their age is when they become a millionaire (only count money in the investment plan, not the cookie jar).

I'm not really understanding the W one... anyone care to help? =/