Solve following questions for present value. a. $100 at the end of three years is worth how much today, assuming a discount rate of 100 percent, 10 percent and 0 percent? b. $100 is received at the end of one year, $500 at the end of two years, and $1,000 at the end of three years. What is the aggregate present value of these receipts, assuming a discount rate of (i) 4 percent? (ii) 25 percent