a sum of money amounts to Rs 780 in 2 years and rupees 1230 in 7 years. find the principal and rate of simple interest.
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interest amount= 1230-780=450 in 5years
interest for 1year=450/5=90
interest for 2 year=180
sum=780-180=600
600*1*r/100=90
r=15%
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