1. 

What is the rate of simple interest ?

I. The total interest earned was ₹ 4000.

II. The sum was invested for 4 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 D

Explanation:

We know that, R = 100 x S.I.
P x T

Now, I gives, S.I. = ₹ 4000.

II gives, T = 4 years.

But, P is unknown. So, we cannot find R.

So, given data is insufficient to get R.

Correct answer is (D).