If rani gives an interest of rs.45 for one year at 9% rate per annum what is the sum she had borrowed
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=> Simple Interest = P x R x T/100 or PRT/100
=> PRINCIPAL = lets consider it as x
=> Rate of interest = 9%
=> Time period = 1 year
=> Simple interest = 45
=> Simple interest = PRT / 100
=> 45 = x( principal ) x 9 x 1 / 100
=> 45 = X x 9 / 100
=> 45 = x9/100
=> 45 = 9x / 100
=> 45 x 100 / 9 = x
=> 5 x 100 = x
=> 500 = x
=> x = 500 is the sum
Amount = Principal + Interest
=> 500 + 45
=> 545 is the total amount which was borrowed .
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