**Question:** The simple interest on a sum of money is Rs. 50. What is the sum?

I. The interest rate is 10% p.a.

II. The sum earned simple interest in 10 years.

**Options are:**

A. I alone sufficient while II alone not sufficient to answer

B. II alone sufficient while I alone not sufficient to answer

C. Either I or II alone sufficient to answer

D. Both I and II are not sufficient to answer

E. Both I and II are necessary to answer

Correct answer is:

E. Both I and II are necessary to answer