Interest I = PRT/100 for Simple Interest Where P = Principal, R = Rate in percentage per year T = Time in years. 100 = P * 5 * 4 /100 100 = 20P /100 100 * 100 = 20P P = 100 * 100 / 20 P = 500. Principal = $ 500. Adam would have to deposit $500.
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Interest I = PRT/100 for Simple Interest Where P = Principal, R = Rate in percentage per year T = Time in years. 100 = P * 5 * 4 /100 100 = 20P /100 100 * 100 = 20P P = 100 * 100 / 20 P = 500. Principal = $ 500. Adam would have to deposit $500.
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