A sum of money becomes 8/5 of itself in 5 years at a certain rate of simple interest . Find the rate of interest?
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let the principal is Rs x
principal+ interest=Rs 8x/5
interest =(8x/5-x)Rs=(8x-5x)/5Rs=Rs 3x/5
rate of interest =r %
we know,
interest=rate of interest×principal×time/100
=> 3x/5=r*x*5/100
=> 3/5=r*5/100
=> r=3*100/5*5
=> r=3*4=12
rate of interest is 12 %
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