The simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by 82. Find the sum
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Simple Interest=100PTR
Simple Interest for 3 years=100P×3×5
Simple Interest for 4 years=100P×4×5
Given:Simple Interest for 4years−Simple Interest for 3=Rs.42
⇒100P×4×5−100P×3×5=42
⇒10020P−10015P=42
⇒5P=4200 or P=54200=Rs.840
∴ sum=Rs.840
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it's answer is rupees 840
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