15. If you knew the world was going to end in one year before you had to repay any interest or principal on a loan you were offered at 7% interest. How much would you borrow? How does your answer change if the interest rate is increased to 17%? 16. What is the total present value of $80 received in 1 year, $300 received in 2 years and $700 received in 6 years if the interest rate is 7% per year? 17. What is the total future value six years from now of $80 received in 1 year, $300 received in 2 years and $700 received in 6 years if the interest rate is 7% per year 18. You have been offered a Perpetuity of $1500 per month and a 25-year Annuity which also pays you $1500 per month. Assume a 5% interest rate for both and they are both offered to you for $275,000. Which one should you purchase and why