16. (5 noints) A perpetuity of $5,000 per year at the end of each year is said to offer a 15% interest rate What is its present value? 17. (5 points) A perpetuity of $5,000 per year beginning today is said to offer a 15% interest rate, what is its present value? 18. (5 points) What is the present value of the following payment stream, discounted at 8% annually: $1,000 at the end of year 1: $2,000 at the end of year 3; and S3,000 at the end of year 5? 19. (5 points) Your car loan requires payments of $200 per month for the first year and payments of $400 per month during second year. The annual interest rate is 12% and payments begin in one month. What is the present value of this 2-year loan? 20. (5 points) What is the present value of a four-period annuity of $100 per year that begins 2 years from today if the discount rate is 9%