5.50 A 10-year annuity pays $1,900 per month, and payments are made at the end of each month. If the interest rate is 9 percent compounded monthly for the first four years, and 7 percent compounded monthly thereafter, what is the present value of the annuity? 5.51 You have your choice of two investment accounts. Investment A is a 10-year annuity that features end-of-month $1,525 payments and has an interest rate of 7 percent compounded monthly. Investment B is an annually compounded lump-sum investment with an interest rate of 9 percent, also good for 10 years. How much money would you need to invest in B today for it to be worth as much as Investment A 10 years from now? 5.52 Given an interest rate of 5.75 percent per year, what is the value at Year 7 of a perpetual stream of $5,000 payments that begin at Year 20