A sum of money lent at simple interest amounts to 783 rupees in 3year and to 5475rupees in 2years .find the sum and rate per cent per annum.
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Amount after 2 years =Rs.783
Amount after 3 years =Rs.837
Therefore,
S.I. of 1 year =837−783=Rs.54
⇒ S.I. of 2 years =54×2=Rs.108
Principal sum =783−108=Rs.675
Therefore,
S.I=PRt/100
54=675 ✖R✖I/100
R=54✖100/675=8 percent
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