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Math operation inside gridview using javascript.

Actually I have to do some calculation inside the Gridview for a stock Management Application.
In the gridview ,
1st column  for Quantity(TextBox)
2nd column for Price/Qty(TextBox)
3rd column for Tax(DropDownlist(which has 3 option-3.5,4.0,0.0))
4th column for Total(Textbox)
 
Suppose Quantity =5
Price/Qty = 10
 Tax=3.5
 Total = (Quantity*Price/Qty)+(Quantity*Price/Qty)*(Tax/100)
 
How ever I was able to do the operation only using textbox-for Tax column
Please help I want to do using a DropDownlist-for Tax column
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