Multiple choice

At what rate of interest a sum of money will become double of itself in 5 years? किस वार्षिक साधारण ब्याज की दर से कोई धन 5 वर्ष में स्वयं का दोगुना हो जायेगा ?

  1. 20%

  2. 25%

  3. 10%

  4. 21%
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A Correct answer
Explanation

For money to double in 5 years at simple interest: Interest = Principal (since 2P - P = P). So P = P×R×5/100, which gives R = 20%. At 20% simple interest, you earn the principal amount as interest in exactly 5 years, doubling your money.

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