A sum of money doubles itself at compound interest in 15 years. In how many years will it become eight times? चक्रवृद्धि ब्याज पर एक धनराशि 15 वर्षों में दोगुनी हो जाती है। कितने वर्षों में यह आठ गुनी हो जाएगी?
A
30 years (30 वर्ष)
B
45 years (45 वर्ष)
C
60 years (60 वर्ष)
D
75 years (75 वर्ष)
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Correct Answer 45 years
Explanation
Money becomes $2^1$ times in 15 years. To become 8 times ($2^3$), it will take $15 imes 3 = 45$ years.