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1). Rs. 6802). Rs. 20003). Rs. 12504). Rs. 3500 |
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Answer» LET the amount LENT at 5% be Rs. x ∴ MONEY lent at 3% = Rs. (4000 – x) SIMPLE interest on Rs. x = (Principal × Time × RATE)/100 ⇒ Simple interest = (x × 4 × 5)/100 = Rs. x/5 Total interest = Rs. 640 ∴ Interest on Rs. (4000 – x) = Rs. (640 – x/5) ⇒ [(4000 – x) × 4 × 3)]/100 = 640 – x/5 ⇒ 3(4000 – x)/25 = 640 – x/5 ⇒ 12000 – 3x = 16000 – 5x ⇒ 2x = 4000 ⇒ x = 2000 ∴ Money lent at 5% is Rs. 2000 |
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