1. 

The simple interest on a sum of money is ₹ 50. What is the sum?

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

II. The sum earned simple interest in 10 years.

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

Answer: Option E

Explanation:

Given : S.I. = ₹ 50.

I gives, R = 10% p.a.

II gives, T = 10 years.

Sum = 100 x S.I. = ₹ 100 x 50 = ₹ 50.
T x R 10 x 10

Thus, I and II together give the answer.

Correct answer is (E).