how you use BA II to calculate this

A BBB-rated corporate bond has a yield to maturity of 8.9%. A U.S. Treasury security has a yield to maturity of 7.5%. These yields are quoted as APRs with semiannual compounding. Both bonds pay semi-annual coupons at a rate of 8.1% and have five years to maturity. a. What is the price (expressed as a percentage of the face value) of the Treasury bond? b. What is the price (expressed as a percentage of the face value) of the BBB-rated corporate bond? c. What is the credit spread on the BBB bonds? a. What is the price (expressed as a percentage of the face value) of the Treasury bond? The price of the Treasury bond as a percentage of face value is %. (Round to three decimal places.)