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

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Question:  The simple interest on a sum of money is Rs. 50. What is the sum?

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

II. The sum earned simple interest in 10 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:

E.     Both I and II are necessary to answer