If you charge $500 on a credit card today, how much will the balance be in two years (assuming no additional fees) if the credit card has a 10% apr that is compounded— a. once a year? b. once a month? c. once a week?

Simple interest:  i = p * r * t; compound interest would be A=p(1+r/n)^(nt)

Here,   A = $500 (1.10)^2 = $605 (answer for "once per year."

Once per month:

A = $500 (1 + 0.10/12)^(12*2) = $610.20

Once per week:  Can y ou figure that out?  # of compounding periods is 12 per year in this problem.

A. dividing 99 by 204 will tell you that 99 out of 204 of the people were females at the action movie.