15. If I buy a 30 -year zero coupon US Treasury bond ( $1,000 Face Value) today at a yield of 3.25%, what price did I pay? (hint: zero coupon bonds don't pay interest) 16. Calculate the APR (Annual Percentage Rate) for the following mortgage: a. Purchase Price - $850,000 b. Down Payment −20% c. Term - 30 Years d. Monthly Payment - $3,340