A certain sum of money doubles itself in 10 years in how much many years will i

Question

A certain sum of money doubles itself in 10 years in how much many years will it trible itself at the same rate?

Options:

A . 20 years

B . 15 years

C . 30 years

D . 17 1/2 years

Answer: Option A

100 ---- 100 --- 10

100 --- 10

--------------------

300 ---- 20 years

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