What is the rate of simple interest? I. The total interest earned was Rs. 4000

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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