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RS aggarwal Practice Aptitude (Simple interest) Questions and Answers with explanation

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Aptitude question and answer on Simple interest

Question : A certain sum of money lent out at S.I. amounts to Rs. 6900 in 3 years and Rs. 7500 in 5 years. The sum lent is
A.    Rs. 4000
B.    Rs. 4500
C.    Rs. 5000
D.    Rs. 6000

Answer : A.  Rs. 4000

S.I. for 2 years = Rs (7500-6900)
                      = Rs. 600
S.I for 3 years = Rs. \(\bigg( {600 \over 2} \times 3 \bigg)\)
                      =Rs. 900
\(\dot{..}\)     Principal = Rs. (6900-900)
                     = Rs. 6000