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S.I. = (P x R x T)/100

where R is rate, T is time, P is Original sum and S.I. is simple interest.

800x100 = P x R x T

P = 80000/(5x7) = 80000/35 = 2285.71

So, the original sum is Rs 2285.71

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12y ago
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Q: The simple interest on a sum for 5 years at 7 percent per annum is Rs800 more than the simple interest on the same sum for 3 years at 9 percent per annum find the original sum of money?
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