Multiple choice

An amount at compound interest doubles itself in 4 years .In how many years will the amount become 8 times itself? कोई मूलधन चक्रवृद्धि व्याज की दर पर 4 वर्षों में स्वयं का दुगुना हो जाता है |कितने वर्षों में यही मूलधन स्वयं का 8 गुना हो जाएगा ?

  1. 8 years/वर्ष

  2. 12 years/वर्ष

  3. 16 years/वर्ष

  4. 24 years/वर्ष
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If amount doubles in 4 years, it becomes 2 times. To become 8 times (which is 2^3), we need 3 such 4-year periods, so total time is 3 × 4 = 12 years. In compound interest, if money doubles in t years, it becomes 2^n times in n × t years.

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