For the best terms on a loan or credit card, you need a credit score above 700. To achieve this, start establishing credit now. Pay all of your bills on time. In addition, use only one-third of your available credit limit and pay off your revolving balance(s) each month. R. J. Johnson has excellent credit. She wants to purchase a piece of equipment for her business and was offered 5% for 48 months for the $66,000 unit. What is her monthly payment by add-on method?