Multiple choice

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

  1. 2.43%

  2. 3.62%

  3. 4%

  4. 5%
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A Correct answer
Explanation

The simple interest for 3 years (from year 4 to year 7) is Rs. 1200-1125=Rs. 75. Annual interest is Rs. 25. In the first 4 years, total interest is 1125-P (where P is principal). So 4×25=1125-P, giving P=1025. Rate = (25/1025)×100 = 2.439%, which rounds to 2.43%.

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