How much attention do you pay to those restaurant checks? I did this same experiment last year, but decided to revisit. Things have gotten worse. I waited until I'd gone to 10 restaurants for lunch or supper. Specifically, 10 restaurants that use manual checks. I haven't found the same problems with the computerized restaurant checks.
So, out of ten places, I found 9 of them had errors on the bill. Ninety percent error rate. Yep. And all of them in the favor of the restaurant. Innocent mistake? Poor math skills? Perhaps, but ninety percent? I think some of these places are deliberately raking people with "errors" on the bills. It's too high a rate to come to any other conclusion. Errors were all at least 10 percent off. One was even more than that. Entrees wrong amount. Tax amount is not correct [In my state each town has its own tax rate, but I found tax amounts that were almost 20 percent when the tax rate was about 7 percent. In other words, they just made up an amount and put it down].
So, eat out at your own peril. And when you get that bill, look it over. You may be surprised.