# Math interest rate

Please explian how to figure out the the initial interest rate of the ARM ?
Given th these facts thanks :)

Ben bought a home with an adjustable-rate mortgage. The margin on the loan is 2.7% and the rate cap is 7.2% The current index rate is 4.3%

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1. beck put \$3000 in a saving account. At the end of 5 years, the account had earned \$900 in interest . At what annual simple interest rate did the account grow.

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2. Calculate i,interest rate

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