What is the bond price of a $1,000 face value bond, with an 8% coupon rate paid semi-annually, that has a required return of 7.5% if

A) The bond has 16 years maturity?

B) The bond has 20 years maturity?

C) What is the Duration of the bond with 16 years maturity, given the above information?

D) What is the Duration of the bond with 20 years maturity, given the above information?

Please show step by step answers with formulas and explanations! Thank you.