Mike's credit card has an apr of 9.89% and a grace period of 16 days, and mike pays his balance in full every month. if his last billing cycle ended on april 25, 2009, and he made his payment on may 13, 2009, did he owe any interest on his last statement's balance? a) no, because he didn’t pay within the grace period b) yes, because he paid within the grace period c) no, because he paid within the grace period d) yes, because he didn’t pay within the grace period