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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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13y ago

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