Given an interest rate of 8.5 percent per year, what is the value at date t = 10 of a perpetual stream of $1,900 payments with the first payment at date t = 20?

You are planning to make monthly deposits of $180 into a retirement account that pays 8 percent interest compounded monthly. If your first deposit will be made one month from now, how large will your retirement account be in 15 years?

If you put up $20,000 today in exchange for a 7.50 percent, 15-year annuity, what will the annual cash flow be?