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posted by Helen on Monday, October 7, 2013 at 8:24pm.
Lakeisha placed $120 in a savings account earning simple interest. Find the interest rate if her account is worth $124.20 after one year.
I = PRT 4.20 = 120 * R * 1 4.20 = 120R 0.035 = 3.5% = R
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