Jessica charges $8500 to a credit card with a 15.54% interest rate. (a) If Jessica makes a payment of $185.56 each month, how many payments will it take to retire the balance? (b) If Jessica doubles the payment to $371.12, how many payments will it take to retire the balance? (c) If Jessica pays $371.12 each month instead of $185.56, how much will she save in interest charges? (a) It will take payments to pay off the debt. (Round up to the nearest integer as needed.)