Multiple choice

In how many years will the sum becomes 5 times of itself at the rate of 5% per annum simple interest? 5% वार्षिक साधारण ब्याज की दर से कितने वर्षों में राशि स्वयं का 5 गुना हो जाएगी?

  1. 80 years 80 वर्ष

  2. 50 years 50 वर्ष

  3. 25 years 25 वर्ष

  4. 12.5 years 12.5 वर्ष

  5. Cannot be determined निर्धारित नहीं किया जा सकता
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For sum to become 5 times itself at simple interest, interest = 4P. Using SI = P×R×T/100: 4P = P×5×T/100. Solving: 4 = 5T/100, so T = 400/5 = 80 years. Option A is correct.

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