Discussion :: Simple Interest

.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.
A.


B.


C.
I and II only 

D.
I and III only, or II and III only 

E.

Answer : Option E
Explanation :
Clearly, any two of the three will give us the answer.
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