A 1k face value corparate bond with a 6.5% coupon ( paid semianually) has 15 years left to mature. It has had a credit rating of BBB and a yeild to maturity of 7.2%. The firm has recently gotten into some trouble and th ratying agency is downgrading the bonds to BB. the new appropriate discount rate will be 8.5%. What will be the change in the bonds price in dollars and percentge terms?

Using excel formula please.