E18 Making requests and complaints in a restaurant (workbook Ex.4) #1877

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Feb 8, 2019 22:00 Diplomat_Zone_E
In the workbook, there is a sentence from exercise 4:

"Finally, at the end of his meal, he discovered that the check was off by $100!"

I didn't understand the last part of "the check was off by $100."

For example, he drank a cup of coffee and it was $5 in the menu. But, the check shows it was $105?

I'd really appreciate it if you could explain the meaning of it showing some examples. Thank you! ^^