What is the rate of simple interest?
I. The total interest earned was Rs. 4000.
II. The sum was invested for 4 years.	Choose the correct choice from the following choices:
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
Explanation:   We know that, R =( 100 xS. I / P x T )   Now, I gives, S.I. = Rs. 4000.   II gives, T = 4 years.   But, P is unknown. So, we cannot find R.   So, given data is insufficient to get R.   answer is (Both I and II are not sufficient to answer).
<result>D</result>
What is the rate of simple interest?
I. The total interest earned was Rs. 4000.
II. The sum was invested for 4 years.