Calculate the Duration of each of the following assuming a yield to maturity of 5%. 1000 Face Value.

A. a 10 year fully amortized loan with payments based on a 2% interest rate

B. a 10 year fully amortized loan with payments based on a 5% interest rate

C. a 10 year fully amortized loan with payments based on a 7% interest rate

D. a 5 year amortized loan with payments based on a 5% interest rate and a 10 year amortization