RRB NTPC CBT-1 previous year question
A certain sum amounts to ₹5,200 in 2 years and ₹6,400 in 4 years at simple interest. What is the rate of interest per annum?
Asked in RRB NTPC 2026 — 14 June Shift 3 · Quantitative Aptitude
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Correct answer: (D) 15 percent
SI for the extra 2 years (year 2 to 4) = 6400-5200 = 1200, so annual SI = 600 and principal P = 5200-2*600 = 4000. Rate = 600*100/4000 = 15% per annum.
हिंदी में प्रश्न
एक निश्चित धनराशि साधारण ब्याज पर 2 वर्षों में ₹5,200 और 4 वर्षों में ₹6,400 हो जाती है। वार्षिक ब्याज दर कितनी है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) 10 प्रतिशत
अतिरिक्त 2 वर्षों (वर्ष 2 से 4) का SI = 6400-5200 = 1200, इसलिए वार्षिक SI = 600 और मूलधन P = 5200-2*600 = 4000। दर = 600*100/4000 = 15% प्रति वर्ष है।
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