A boy buys 9 apples for Rs.9.60 and sells them at 11 for Rs.12. Find his gain or loss percent.
Since the boy bought 9 apples and sold 11 apples then this must be only possible if he a total of multiple of 9 and 11.
Therefore, let the the total apples be LCM of 9 and 11 which is 99.
Now, CP of 9 apples =Rs.9.60
Therefore, CP of 99 apples =Rs.9.60×11=Rs.105.6
Also, SP of 11 apples =Rs.12
Therefore, SP of 99 apples =Rs.12×9=Rs.108
As SP > CP, therefore,
Profit = SP − CP
Hence profit percent earned by the boy is 2.27%.