a) What amount would he need to place in an investment account earning 11% interest compounded quarterly in order to reach his retirement goal? (3 marks)

b) If Brett at the end of 3 years has $10,900, how much interest did he earn, if he originally invested $7500?

c) Find the principal which was invested in the following. (3 marks each)

5 years, 3% compounded annually, $12,350 maturity

15 years, 7.25% compounded quarterly, $136,770 maturity

30 months, at 4% compounded monthly, $3000 maturity