Multiple choice

A certain sum at a certain rate of SI amounts to Rs. 1125 in 4 years and Rs. 1200 in 7 years. Find the rate of interest. एक निश्चित धनराशि एक निश्चित साधारण ब्याज की दर पर 4 वर्षों में 1125 रू. हो जाती है और 7 वर्षों में 1200 रू. हो जाती है। ब्याज की दर क्या है?

  1. 2.43%

  2. 3.5%

  3. 4.4%

  4. 3%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Interest for 3 years (7-4) = Rs 1200 - Rs 1125 = Rs 75. So interest for 1 year = Rs 75/3 = Rs 25. Simple interest is constant each year. Principal = Amount after 4 years - 4 years interest = Rs 1125 - (4 × 25) = Rs 1025. Rate = (Interest per year/Principal) × 100 = (25/1025) × 100 = 2.439...% ≈ 2.43%. Option A is correct.

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