Mocha Word Puns

So at the cafe that I work at, we have these punch cards, where, when you buy ten drinks, you get a free one. This customer rolls up through our drive through and this happens:

Customer: "Can I get a large white mocha with whip?"

Coworker: "Sure thing! That will be $3.95 today."

Customer: pulls out full punch card "You mean FREE ninety five?"

Oh my god.

Edit: I acedentally a word