Question
The simple interest on a sum of money is 9/35 of the
sum. If the number of years is numerically 5/7 times of rate percent per annum, then the rate percent per annum is?Solution
SI: P= 9:35, T: R =5:7 SI=9x, P=35x, T= 5y, R=7y then the find value of x? SI= PRT/100 9x = (35x × 7y × 5y)/100 36 =49y² y² = 36/49  y = 6/7 so, the rate of interest R = 7y=7×6/7 R= 6%
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