RRB Group D practice question
The simple interest on a certain sum for 3 years at 10% per annum exceeds the simple interest on the same sum for 2 years at 12% per annum by ₹570. Find the sum.
From a RRB Group D Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) ₹9,500
SI₁ − SI₂ = P × (10 × 36/12 − 12 × 24/12)/100 = P × (30 − 24)/100 = P × 6/100 = ₹570. So P = ₹570 × 100/6 = ₹9,500. (Convert months to years before multiplying.)
हिंदी में प्रश्न
एक निश्चित धनराशि पर 10% वार्षिक दर से 3 वर्ष का साधारण ब्याज, उसी राशि पर 12% वार्षिक दर से 2 वर्ष के साधारण ब्याज से ₹570 अधिक है। धनराशि ज्ञात कीजिए।
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सही उत्तर: (D) ₹9,500
ब्याज₁ − ब्याज₂ = P × (10 × 36/12 − 12 × 24/12)/100 = P × (30 − 24)/100 = P × 6/100 = ₹570। अतः P = ₹570 × 100/6 = ₹9,500। (गुणा करने से पहले महीनों को वर्षों में बदलें।)
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