Posted by Caleb on Wednesday, February 9, 2011 at 8:56pm.
I need help figuring out simple interest and the balance of an account. Example P = $525, r = 6%, t + 9 years

Pre Algebra  helper, Wednesday, February 9, 2011 at 9:22pm
The formula for simple interest is,
I = PRT (Interest = Principle * Rate * Time)
Balance of account ?
t + 9 years? 
Pre Algebra  tia, Thursday, March 3, 2011 at 7:12am
two sums of money totaling 15000 earn 5% and 7% annual interest. if the total interest from both investments amounts to $870, how much is invested at each rate?