3, (10 points) a) Consider a 581 bond, maturing 12/31/02 (coupon payment date is 06/30 and 12/31 ), trading at 101:11 for settlement 8/12/02. Calculate accrued interest and invoice price (M=100,000). b) Consider now a 521 bond, maturing 3/31/03, trading at 102:15 for settlement 8/12/02. Calculate accrued interest and invoice price (M=100,000)