The interest earned on ₹ 8000 when invested in some scheme for 2 years at 7 % simple interest, per annum is half of the interest earned on another amount P invested for five years in the same scheme at the same rate of interest. Find the value of P.किसी योजना में 2 वर्ष के लिए 7% वार्षिक साधारण ब्याज की दर पर निवेशित ₹ 8000 पर अर्जित ब्याज, उसी योजना में उसी ब्याज दर पर 5 वर्ष के लिए निवेशित दूसरी राशि P पर अर्जित ब्याज का आधा है। P का मान ज्ञात कीजिए।
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Correct answer: C. ₹ 6400
Explanation
Interest on ₹8000 = (8000 × 7 × 2)/100 = ₹1120. This is half of the interest on P, so interest on P = ₹2240. Also interest on P = (P × 7 × 5)/100 = 0.35P. Thus 0.35P = 2240, giving P = ₹ 6400.₹8000 पर ब्याज = (8000 × 7 × 2)/100 = ₹1120। यह P पर मिले ब्याज का आधा है, अतः P पर ब्याज = ₹2240। साथ ही P पर ब्याज = (P × 7 × 5)/100 = 0.35P। अतः 0.35P = 2240, जिससे P = ₹ 6400।More Mathematical Reasoning and Aptitude questions
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