How do I solve this?

The problem you must solve is: Lenders primarily use the Fair Isaac Corporation (FICO) model to determine credit scores. FICO grades consumers on a 300- to 850-point range; a higher score indicates less risk to the lender. A score of 800 or higher is considered exceptional; 740 to 799 is very good; 670 to 739 is good; 580 to 669 is fair; and 579 or lower is poor. According to MyFICO.com your credit score can impact interest rates available to you as follows: FICO score APR 760-850 4.17% 700-759 4.392% 680-699 4.569% 660-679 4.783% 640-659 5.213% 620-639 5.759%