When using a credit card, the interest payment for paying the balance off entirely in the first month is zero. a a fixed rate determined by the number of purchases. b. a fixed rate determined by the total amount of the purchases. c. a fixed rate determined by the person's credit score. d. a fixed rate based upon the person's bank accounts with the bank. e. The terms "index rate", "margin", "interest rate cap", and "payment cap" refer to how much a line of credit will be. a. how much income can be deducted from taxes. b the credit score of the individual. a fixed rate loan d. an adjustable rate loan e a Using credit cards can enable people to increase their credit score. b have receipts for business travel expenses. support causes of interest. dobtain frequent flyer miles. all of the above