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Xero features a handy inbuilt calculator on its invoices. However, this feature is rather useless if one is populating the invoice with inventory items ("Products and Services") where the Cost Price and Sale Price have already been set, or migrating said items from Projects to a new invoice.

Having the inbuilt calculator in the Sale Price text box when setting up or updating Inventory Items would eliminate the need to keep switching from Xero to a calculator app to apply the correct markup for each item. Better yet would be a dropdown menu feature like is found in Projects to choose "% Markup, Custom Price, Pass Cost on, Nonchargeable" for greater flexibility with inventory items. These are two features that already exist in the Xero universe. It shouldn't be too difficult to apply them here.