36.98 * 12 = 443.76
443.76 - 415 = 39.76
I = PRT
39.76 = 415R
0.0958 = 9.58% = R
vacuum cleaner was purchase on the installment plan with 12 monthly payments $36.98 each. If the cash price was $415 and there was no down payment , find the annual percentage rate.
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