SSC CPO SI and ASI Model Paper 1

(4) Let the sum be ₹ x.
∴ x becomes 2x in 4 years
∴2x becomes 4x in next 4 years
∴4x becomes 8x in next 4 years
∴8x becomes 16x in next 4 years
Thus, it will be 16 times in= (4 + 4 + 4 +4) = 16 years