part a and b please

2. (7 points) If you purchase a 5 -year, zero-coupon bond for $691.72. a. (4 pts) How much could it be sold for 3 years later if interest rates have remained stable? b. ( 3pts ) How much could it be sold for 3 years later if interest rates increase by 2% ? Why is your answer lower than your answer in part a