The figure below shows the balance, P, in a bank account. P (dollars) P = f(t) (9, 3000) (3, 2000) (years) (a) Find a possible formula for P = f (1) = ab' assuming the balance grows exponentially Round your answers to three decimal places. a = i and b= (b) What was the initial balance? Round your answer to two decimal places. Initial Balance =$ (c) What annual interest rate does the account pay? Round your answer to three decimal places. The annual interest rate is %