How to keep inventory for 2 items at one price?

[VHS-Band]

I am starting to run a small highschool concession stand. We have individual items - hamburger and fries. I think I understand how inventory works for that. But we also have a basket with hamburger and fries for a discounted cost. How would I keep up with inventory for this?

[Candlestore]

@VHS-Band 

Use Square Bundles.  I sell Soaps and Candles.  We may put together a Gift set of both items for a Discounted price.  This then decreases the Inventory of the Items included in the Gift Basket.  Here is a Link to Bundles : New-Create-and-Sell-Bundles-for-Retail/td-p/673244 

Currently this is available for Square for Retail....not sure which Point of sale system you use with Square.  Since you mention Concession stand I think you might be using Square for Restaurants but I am not sure.