### The cost of a bat is a two digit number (for example $xy). Its selling prices has same digits as cost with digits interchanged ($yx). If its profit margin is divided by 9, find the remainder of division.

1. Let the cost of bat is $xy . Another way of depicting the cost is 10x + y . 2. So the selling price of the bat will be$yx. Another way of depicting the selling price is 10y + x .
For example - if cost is $46 , then selling price will be$64 .