Discussion :: Simple Interest

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:
Answer : Option C
Explanation :
S.I. for 1 year = Rs. (854  815) = Rs. 39.
S.I. for 3 years = Rs.(39 x 3) = Rs. 117.
Principal = Rs. (815  117) = Rs. 698.
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