Multiple choice

A sum of money becomes 21/20 of itself in 1/5 years at a certain rate of simple interest. The rate of Interest per annum is- कोई धन साधारण ब्याज की दर से अपने का 21/20 गुना 1/5 वर्षों में हो जाता है। ब्याज की वार्षिक दर क्या है?

  1. 15%

  2. 25%

  3. 20%

  4. 5%
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B Correct answer
Explanation

Using SI formula: Amount = P(1 + rt/100). Here Amount = (21/20)P, time = 1/5 year. So (21/20) = 1 + r/500. Solving: 1/20 = r/500, r = 25%.

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