19. Assume payments of $2,000, $5,000, and $3,000 are received at t = 3, 4, and 5, respectively. What five equal payments occurring at the end of t = 1, 2, 3, 4, and 5, respectively, are equivalent if i = 10% compounded per period? 20. Tuition costs are expected to increase at a rate of 8% per year. The first year's tuition is due one year from now and will be $2,000. A fund is to be set up today to cover tuition costs for 4 years in an account that will earn interest rate (i). How large must the fund be if: (a) i = 5% (b) i = 8% (c) i = 10%