What is the principal sum?
I.The sum amounts to Rs. 690 in 3 years at S.I.
II.The sum amounts to Rs. 750 in 5 years at S.I.
III.The rate of interest is 5% p.a.  Choose the correct choice from the following answers: A) I and III only B) II and III only C) I and II only D) I and III only, or II and III only E) Any two of the three
Explanation:   Clearly, any of the three will give us the answer.   answer is (Any two of the three).
<result>E</result>
What is the principal sum?
I.The sum amounts to Rs. 690 in 3 years at S.I.
II.The sum amounts to Rs. 750 in 5 years at S.I.
III.The rate of interest is 5% p.a.