# QA – Placement Quizzes | Compound Interest | Question 14

The least number of complete years in which a sum of money put out at 20% compound interest will be more than doubled is:**(A)** 6**(B)** 4**(C)** 5**(D)** 3**Answer:** **(B)****Explanation:** Let the Principal be P. Then,

P(1 + 20%)^n > 2P

Or, P(1 + 1/5)^n > 2P

Or, P(6/5)^n > 2P

Or (6/5)^n > 2.

Now,

(6/5)^3 = 1.728

(6/5)^4 = 2.074

Therefore, in 4 years.

Quiz of this Question

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