A bond redeemable at par means that the redemption amount C is equal to the face amount F. Find the prices of the following bonds redeemable at par: 1. A 10-year 100, 5% bond yielding 7.2%; 2. A 10-year 100, 5.5% bond yielding 7.7%;; 3. A 12-year 100, 5% bond yielding 7.2%;; 4. A 12-year 100, 5.5% bond yielding 7.7%