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6.5%

Formula for finding Simple Interest

SI [Interest] = (P×R×T)/100
P [sum] = (SI×100)/(R×T)
R [Rate/year] = (SI×100)/(P×T)
T [Time] = (SI×100)/(P×R)


where
S.I. = Simple Interest,
P = Principal or Sum of amount,
R = % Rate per annum,
T = Time Span

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Q: Suppose you invest 1200 in four years You earned 312 in simple interest What is the interest rate?
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