Monthly rate = 1. 25% Date Payments Purchases Balance Number of Days Product/Sum 9/1 - 9/5 $387. 52 5 $1,937. 60 9/6 $50. 00 $337. 52 1 $337. 52 9/7 - 9/18 $ $ 9/19 $62. 26 $399. 78 1 $399. 78 9/20 - 9/30 $ $ Total 30 $ The average daily balance = ÷ 30 = $. Finance charge = monthly rate x average daily balance = $. New balance = previous balance - payment/credits + finance charge + new purchases = $