Home » Aptitude » Simple interest » Question
  1. In how many years will a sum of money double itself at 12% per annum?
    1. 8 yrs. 6 months
    2. 6 yrs. 9 months
    3. 8 yrs. 4 months
    4. 7 yrs. 6 months
Correct Option: C

If the principal be ₹ 100 then S.I. = ₹ 100.

∴ Time =
SI × 100
Principal × Rate

Time =
100 × 100
=
25
year
100 × 123

Time = 8 years 4 months
Second method to solve this question :
T =
(n - 1)
× 100
R

T =
(2 - 1)
× 100
12

T =
100
year
12

T =
25
year
12

T = 8
1
year
3

T = 8 years 4 months.



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