Popular fast food chain adds enormous automatic tip to woman's receipt

A woman was left baffled after a Subway restaurant added a huge tip to her bill for four items and a drink she poured herself.

In a recent the customer said that a 20 percent automatic tip was added to her bill at a location in .

She ordered a pretzel for her and her husband, two footlong subs for her nieces, and a drink that she had to fill up herself at a soda machine.

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