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Assumption: "7 2" is actually 7.2

Simple interest is simple. All you do is multiply the principal by the rate to get the yearly amount of interest. Therefore, 3900 times 7.2 is the same as $3900 x 0.072 = $280.80 per year interest. Since its over 3 years, just multiply by 3.

Therefore, you get $280.80 x 3 = $842.40 in interest.

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Q: How much will Pauline pay in interest if she takes out a simple interest loan with a principal of 3900.00 at 7 2 percent for 3 years?
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