Darnell s credit card has an APR of 19 calculated on the previous monthly balance and a minimum payment of 2 starting the month after the first purchase His credit card record for the last 7 months is shown in the table below End of month 1 234567 Previous balance O 0 00 800 00 796 67 793 35 790 04 786 75 783 47 A 9 B 21 C 79 New charges 800 00 D 19 0 00 0 00 0 00 0 00 0 00 0 00 Payment received 0 00 16 00 15 93 15 87 15 80 15 73 15 67 Finance charges 0 00 12 67 12 61 12 56 12 51 12 46 12 40 Principal paid 0 00 About what percentage of Darnell s payments so far have gone to paying interest 3 33 3 32 3 31 3 29 3 28 3 26 New balance 800 00 796 67 793 35 790 04 786 75 783 47 780 21