I have a form with a grid which lists credit cards transaction amounts, with a drop down box for "type of credit" (visa, mastercard, discover). The bottom of the form has 3 different total lines; one for each of the credit card types. I would like to know how I get the amounts entered on the grid above to be included onto the correct total line, depending on what type of credit card was chosen from the dropdown on that row. Since I'm not versed in java script, I'm having difficulty figuring out how to accomplish this type of calculation
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