Multiple choice

The difference between compound interest and simple interest on an amount of Rs. 15,000 for 2 years is Rs. 150. What is the rate of interest per annum? 15000 की धनराशि पर 2 वर्षों के लिए साधारण ब्याज और चक्रवृद्धि ब्याज में अन्तर रू. 150 है। ब्याज की वार्षिक दर क्या है?

  1. 8%

  2. 12%

  3. 10%

  4. 15%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For 2 years, the difference between compound interest and simple interest is P*r²/10000. Setting 15000*r²/10000 = 150 gives r² = 100, so r = 10%. The key insight is that CI-SI for 2 years depends only on principal and rate squared.

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