In how many years, a sum will become four times itself at the rate of

1.	In how many years, a sum will become four times itself at the rate of 12% per annum ?
A.	28 yr
B.	25 yr
C.	22 yr
D.	27 yr
Answer» C. 22 yr

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In how many years, a sum will become four times itself at the rate of 12% per annum ?

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