Multiple choice

A sum of money double itself at a compound interest in 15 years. In how many years will it become 8 times. कोई धन चक्रवृद्धि ब्याज की दर से 15 वर्षों में अपने का दुगना हो जाता है। कितने वर्षों में धन अपने का आठ गुना हो जायेगा।

  1. 30 years / वर्ष

  2. 45 years / वर्ष

  3. 60 years / वर्ष

  4. 40 years / वर्ष
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Money doubles in 15 years, so 2× in 15 years. To reach 8×, note that 8 = 2³, so we need 3 doubling periods: 3 × 15 = 45 years. Alternatively, using compound interest formula: 2⁴⁵/¹⁵ = 2³ = 8.

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