8.9 You have made an investiment that will yield $5 000 exactly 10 years liom today. If the current interest rate is 4.8 percent compounded quarterly, what is your investment worth today? 8.10 Your parents have agreed to lend you $10,000 to help with your college expenses. They do not expect you to repay the loan or any interest until you have finished school (five years) and worked for 10 years. At the end of 15 years, they will require a lump-sum payment of $80 000. (a) What equivalent annual interest rate are your parents charging for the use of their money? (2) If your parents cannot lend you money and you have to borrow $40 000 at 6.6 percent annual interest, what would the lump- sum payment be at the end of 15 years?