In 2007, rachel borrowed $800 from a bank; she has repaid $2,700 after three years. at what rate of compound interest did the bank lend money to rachel? (interest is compounded annually). hint: a = p (1 + r)n a – amount of money paid after n years p – principal amount r – interest rate n – number of years 0.1% 3% 50% 5.5% 8%