Calculate growth rate on the fly and bind to gidview

Hi All

I have a requirement like need to get the numbers from diffrent tables and calculate the growth rate using the formula like ((number2-number1)/number1)*100 and bind it to gridview. Right now I am getting the numbers from each table, calculating growth rate @code behind and save the result into temp table and next getting the result from temp table and bind it to gridview. this is very lengthy process and low performanance.

Can any one help me how to do growth rate on the fly and bind it to gridview. Finally the gridview data should be growth rate desc order.