IBPS RRB Officer Scale-I Prelims practice question
A sum of ₹39,000 becomes ₹51,909 in 3 years at compound interest, compounded annually. What is the rate of interest per annum?
From a IBPS RRB Officer Scale-I Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 10%
(1 + r/100)3 = A/P = ₹51,909/₹39,000 = 1331/1000 = (11/10)3. So 1 + r/100 = 11/10 ⇒ r = 1/10 × 100 = 10%. (The SI formula gives 11.03%, which is wrong for CI.)
हिंदी में प्रश्न
₹39,000 की राशि चक्रवृद्धि ब्याज पर (वार्षिक संयोजन) 3 वर्ष में ₹51,909 हो जाती है। वार्षिक ब्याज दर क्या है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 10%
(1 + r/100)3 = A/P = ₹51,909/₹39,000 = 1331/1000 = (11/10)3। अतः 1 + r/100 = 11/10 ⇒ r = 1/10 × 100 = 10%। (साधारण ब्याज सूत्र से 11.03% आता है, जो चक्रवृद्धि के लिए गलत है।)
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