Multiplication in Adobe Acrobat DC Pro

Hello All,

I have created a Wholesale Pricelist that has all of my SKUs listed, dealer cost, MSRP, QTY that you want to buy, then I have a column for the total per item, that will later add up to an expected grand total. What I need your help with is how do I multiply the fixed dealer cost field (position is column 6 for each line) by the variable QTY field (column 😎 to get a total (column 10) for each line? 

Thanks in advance!!