When I go shopping I tend to keep a running tally of how much I’m spending. I round up to account for tax, sometimes round down when I think I’ve done too much rounding up. It gives me a good idea of how much I’m spending.
Today I got to the checkout counter, expecting it to be somewhere between $100 & $110. It’s not a perfect system, if I got charged 30¢ extra for something I’d never know.
But today I noticed. Harmons is having a 5 packs of meat for $20 deal this month. Since I have a freezer in the basement I decided to take advantage of it and picked up 15 packs (about 1½ lbs each).
After he got done ringing me up the total was $132.47. I knew something was wrong, but decided that instead of tying up the line just to find out I made a mathematical error, I decided to go over it at home.
Turns out I was right. If you look at the receipt (click to see better) it turns out that the first 5 packs were rung up as a group of 4 and a single one. The computer is supposed to subtract the original amounts and add $20. Well, it returned the single pack, but charged me the $20 plus the original $24.92 for the first 4 packs.
Fortunately I noticed this, went back to the store, was able to explain it to the Customer Service person and got a refund.