Multiple choice

A sum of Rs.61440 was invested in a bank offering 12.5% comprond interest. Find the difference of CI of second year and third year. रू. 61440 एक बैंक में निवेश किये गये जो 12.5% चक्रवृद्धि ब्याज देता है। दूसरे तथा तीसरे वर्ष के चक्रवृद्धि ब्याज का अन्तर ज्ञात कीजिये।

  1. Rs./रू.1024

  2. Rs./रू.1080

  3. Rs./रू.940

  4. Rs./रू.1230
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B Correct answer
Explanation

CI for 2nd year = P(1+12.5/100)^2 - P(1+12.5/100) = 61440 × 0.140625. CI for 3rd year = 61440 × (1.125)^3 - 61440 × (1.125)^2 = 61440 × 0.158203. Difference = Rs. 1080.

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