please answer the following:

A bank issued a mortgage-backed security (MBS) with a par value of $20,000. This MBS will mature in 10 years, and it will have an annual coupon of 8%. The market rate of interest is 12%. (a) What is the sales price of this MBS? (b) After purchasing this MBS, an investor decides to sell it in 5 years, when the new market rate of interest has fallen to 10%. How much will this MBS be worth in 5 years