Please show full work for me to understand. Thank you!

Suppose Ford sold an issue of bonds with a 5-year maturity, a $1,000 par value, a 12% coupon rate, and semiannual interest payments. Two years after the bonds were issued, the going rate of interest on bonds such as these fell to 9%. At what price would the bonds sell? Answer: $1,227.20 a. b. Suppose that, two years after the bonds' issue, the going interest rate had risen to 13%. At what price would the bonds sell? Answer: $938.04 Today, the closing price of the bond is $783.58. What is the effective current yield? Answer: The effective annual current yield = 15.9% c