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Simple Interest - General Aptitude

Q1:

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:

A Rs. 650

B Rs. 690

C Rs. 698

D Rs. 700

ANS:C - Rs. 698

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.