If you invest P dollars every year for tyears in an account with an interest rate of r (expressed as a decimal) compounded n times per year, then you will have accumulated 0 dollars as a function of time, given by the following formula. Compound Interest Formula, with Annual lnvestmentsr P(1+n) [1 (1+n ] _ E n 1 (1 + n) If you would like the derivation of this formula, please send me an email and I will send you the iniormation. C(t) =