How much does it cost for an order of fish and chips if you don't get the fish and you hold the chips?

I need a theory of semantics that accounts for this pic.twitter.com/PQjKV0bSSO

— Joshua Raclaw (@joshraclaw) February 28, 2020

Ignore the fact that only 9 percent of the items on the Fish and Chips menu here include both fishand chips, I'm still trying to figure out the costs. Chips seem toadd 1.90 to every other Fish & Chip option (regardless of its fishiness), but if you order chips without the chips, then theyonly cost 1.90 yet, if you add chipsto your chips (which is presumably one whole order of chips, rather than 2), then it only adds 0.50 to the standard cost that you would otherwise pay for the null set of chips.

Am I doing this right?

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