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getting a subtotal from a parallel array using a combobox that populates a listbox  RSS feed

jake fowler
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Hello Everyone!! I am in need of some help... I have a program that is a restaurant app. I am having trouble mainly because I just don't know how to get my subtotal, tax, and total. I can get a single subtotal from a single selection but how do you work in multiple selections??? I have included some of the code. I would like to do this without the calculate button so as I click an item from the combobox and add it to the listbox it adds it to a subtotal somehow. But the calculate button will do. Could someone please point me in the right direction???

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