Four years ago, Firm A issued a 12 year and a 22 year bond. The bonds each have a coupon rate of 6.25%, paid semiannually. Assume the yield to maturity on each of these bonds is now 7%. What is the percentage change in the price of the 12-year bond since it was issued? The 22-year bond? Assume that both bonds were issued at par four years ago. Answers with excel formulas will be appreciated