Carmel owes $2902.40 on her bankcard. (a) If the interest rate is 15.5%, how much interest will she pay per year? (b) Interest is calculated dail at 0.04246% and charged monthly. How much will Carmel pay for a 30day month? (c)If she pays $500 off her bankcard bill on 15th July, how much interest will she pay for this month? I've figured out a, b.