A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 yeaRs. The sum is:
1). 650
2). 690
3). 658
4). 698
As sum of money amounts to Rs. 815 in 3 years and Rs. 854 in 4 years
So,
S.I. for 1 year = Rs. 854 – 815 = Rs. 39
S.I. for 3 years = Rs. 39 x 3 = Rs. 117
Principal = Amount – S.I. (we are considering the case for 3 years)
Principal = Rs. (815 - 117) = Rs. 698