A web page generated from a query displays a table of results with one column being a field into which I can put numbers. Let's call column A and B the results (which are numbers) and column C the field into which I can enter a number. I want to be able to add A+B and then multiply the sum by a variable of my choosing (x). I then want to repeat that same calculation ([A+B]*x]) in all rows in the table. I'm picturing a browser extension that creates a drop down in column C when I click on it which allows me to enter a multiplier, but I'm not wedded to a particular implementation.
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If you want the calculation should be done immediately or after submitting the button? We can use JQuery to do it in client side or PHP to do it in Server side. It`s depends on your requirement how you want it.