Multiple choice

The simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by Rs.21. The sum is- एक निश्चित राशि पर 5% वार्षिक ब्याज की दर से 3 वर्षों और 4 वर्षों के साधारण ब्याज में अन्तर रु.21 है। राशि है-

  1. Rs./रु.105

  2. Rs./रु.140

  3. Rs./रु.375

  4. Rs./रु.420
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Difference between SI for 4 years and 3 years = SI for 1 year = Rs. 21. At 5% per annum, SI for 1 year = 5% of Principal. So 5% of P = 21 → P = 21 × 100/5 = Rs. 420. Option A (Rs.105) would give SI of Rs.5.25 per year. Option B (Rs.140) would give SI of Rs.7 per year. Option C (Rs.375) would give SI of Rs.18.75 per year.

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