**Question:** What is the rate of simple interest?

I. The total interest earned was Rs. 4000.

II. The sum was invested for 4 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:**

D. Both I and II are not sufficient to answer