Question

A certain sum doubles itself in 4 years. The time-
taken to it to become thrice itself is
(A) 6 years (B) 8 years
(C) 10 years
(D) 12 years​

Answer 1

Step-by-step explanation:

${2}^{1 = 4yrs} \\ {2}^{3 =3 \times 4yrs } \\ = 12yrs$