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I want to multiply data from two different columns of a same report and want output in third column

I am creating POS invoice which does not give weight per item detail because of which I am unable to get detail of total net weight of invoice, in a standard report i am getting weight per item and qty of item sold in invoice. I desire to get multiplication of these two column and get data in third coloumn.

pls guide further.

share your print format code