A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years = ?
A. 14 years
B. 28 years
C. 21 years
D. 10 years
Answer: Option C
Solution (By Examveda Team)
$$\eqalign{ & \frac{{\left( {n - 1} \right)}}{{{t_1}}} = \frac{{\left( {m - 1} \right)}}{{{t_2}}} \cr & \frac{1}{7} = \frac{3}{{{t_2}}} \cr & {t_2} = 21{\text{ years}} \cr} $$This Question Belongs to Arithmetic Ability >> Interest
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