Multiple choice

A certain sum amounts to Rs.291600 in 2 years and to Rs.314928 in 3 years on compound interest compounded annually. How much will be the simple interest (in Rs.) on Rs.40,000 at the same rate for 2 years? एक निश्चित राशि सालाना चक्रवृद्धि ब्याज पर 2 साल में 291600 रुपये और 3 साल में 314928 रुपये हो जाती है। 2 वर्ष के लिए समान दर पर 40,000 रुपये पर साधारण ब्याज (रु में) कितना होगा?

  1. 7500

  2. 6400

  3. 8000

  4. 9600

  5. 10400
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B Correct answer
Explanation

From the compound interest data, find the rate by dividing the amount after 3 years by amount after 2 years: 314928/291600 = 1.08, so r = 8%. Then simple interest on 40000 for 2 years at 8%: 40000 × 0.08 × 2 = 6400.

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