47. A sum of money at simple interest amounts to *5852 in 3 years and 37788 in 7 years. What is the rate of interest per annum?
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Answer:
S.I. for 1 year =Rs.(854−815)=Rs.39
S.I. for 3 years = Rs. 39×3=Rs.117
Therefore,
Principal =Rs.815−Rs.117=Rs.698
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