Kevin has just finished paying off his loan. He was assessed a service charge of $422. He paid off the principal and the interest by making weekly payments of $36.13 for four years. If the principal was $7,150, how much did Kevin pay in finance charges, to the nearest dollar?

There are 52 weeks in a year, so Kevin made 52 × 4 = 208 payments. The payments totaled 208 × $36.13 = $7,515.04, making the interest $7,515.04 − $7,150 = $365.04, or about $365. Add the $422 service charge: $365 + $422 = $787 in finance charges, so the answer is $787.

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