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A sum of money placed at compound intere...

A sum of money placed at compound interest doubles itself in 5 years. It will amount to eight times itself at the same rate of interest in-
एक धनसशि चक्रवृद्धि ब्याज पर 5 वर्ष में दुगुनी हो जाती है। ब्याज की समान दर पर वह कितने वर्षो में 8 गुना हो जाएगी?

A

20 yr

B

10 yr

C

12 yr

D

15 yr

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