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Suppose the amount is Y

then Y*(1.09)3 = Y+405

Y*(1.093 - 1) = 405

Y = 405/(1.093 - 1) = 405/0.2590 = 1372.75 (approx)

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Q: What sum of money will yield an interest of RS405 in 3 years at 9 percent per annum?
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