# QA – Placement Quizzes | Simple Interest | Question 14

A sum of money doubles itself in 10 years at simple interest. What is the rate of interest?**(A)** 11**(B)** 15**(C)** 20**(D)** 10**Answer:** **(D)****Explanation:** SI = P

P = P X R X 10/100

R= 10 %

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