Multiple choice

A sum amounts to Rs 1210 in 2 years when invested at compound interest. If principal is Rs 1000, then what is the rate of interest (in %)? एक धनराशि चक्रवृद्धि ब्याज पर निवेश करने पर 2 वर्षों में 1210 रु. हो जाती है । यदि मूलधन 1000 रु है, तो ब्याज दर (% में) क्या है?

  1. 10

  2. 20

  3. 15

  4. 12
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using compound interest formula: A = P(1 + r/100)^n. Substituting values: 1210 = 1000(1 + r/100)^2, giving 1.21 = (1 + r/100)^2. Taking square root: 1.1 = 1 + r/100, so r = 10%. The amount grows by 21% in 2 years at compound interest, which corresponds to 10% annual rate. Options B, C, and D are incorrect rates.

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