4) Michael invested $2,000 12 years ago. Michaels friend, Lisa also invested $4,000 6 years ago. Today, both Michael's and Lisa's investments are each worth $9,700. Assume that both Michael and Lisa are earning their rates of returns, what should the average annual interest rate be earned by Lisa? Is it higher or lower than the return earned by Michael? Justify the answer with calculations and reasoning both. (30 marks)