4. In planning for retirement, a couple considers a number of retirement options. ( The first option is make an annual deposit of 4000 for 12 years at the end of each year at an annual interest rate of 8%. Determine the value of the fund at the end of 10 years. (ii) Suppose a company offers to pay the couple an annuity of 20,000 a year payable in arrears for 12 years at an interest rate of 8%, determine how much this stream of income is worth in today's dollars