SSC GD Constable previous year question
If at a certain rate of interest, in 2 years, the simple interest is ₹40 and the compound interest is ₹56, find the principal (₹).
Asked in SSC GD Constable 2025: 10 Feb 2025 Shift 3 (Evening) · Quantitative Aptitude
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Correct answer: (B) 25
Difference between CI and SI for 2 years = P(r/100)²= 16, and SI = 2Pr/100=40 gives r=800/P; substituting: P(800/(100P))²=16 → 6400/P=16 → P=... Solving simultaneously with rate: rate = 80% and P=25.
हिंदी में प्रश्न
यदि समान ब्याज दर पर, 2 वर्ष में, साधारण ब्याज ₹40 तथा चक्रवृद्धि ब्याज ₹56 है, तो मूलधन (₹ में) ज्ञात करें।
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उत्तर और व्याख्या देखें
सही उत्तर: (B) 25
2 वर्ष के लिए CI और SI का अंतर = P(r/100)²=16, तथा SI=2Pr/100=40 से r=800/P मिलता है; हल करने पर दर = 80% और मूलधन P=25।
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