Delhi Police Constable practice question
A sum amounts to ₹8,120 in 4 years at 4% per annum simple interest. What is the simple interest on the same sum for 1 year at the same rate?
From a Delhi Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) ₹280
A = P(1 + RT/100) ⇒ P = ₹8,120 × 100/(100 + 4 × 4) = ₹8,120 × 100/116 = ₹7,000. SI for 1 year = ₹7,000 × 4 × 1/100 = ₹280. (Applying the rate to the amount ₹8,120 gives ₹324.8, which is wrong.)
हिंदी में प्रश्न
एक धनराशि 4% वार्षिक साधारण ब्याज की दर से 4 वर्ष में ₹8,120 हो जाती है। उसी दर पर उसी राशि का 1 वर्ष का साधारण ब्याज कितना है?
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सही उत्तर: (A) ₹280
A = P(1 + RT/100) ⇒ P = ₹8,120 × 100/(100 + 4 × 4) = ₹8,120 × 100/116 = ₹7,000। 1 वर्ष का ब्याज = ₹7,000 × 4 × 1/100 = ₹280। (दर को मिश्रधन ₹8,120 पर लगाने से ₹324.8 आता है, जो गलत है।)
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