I was in a store where a display of items next to the cash register had a sign marked "50% off." I handed the cashier one of the items, which was originally priced at $25.00. She couldn’t figure out how much half price would be. She called over another cashier who couldn’t get it either. They refused to believe me when I told them. They had to call over a manager. The blame probably lies with many sources, but this is all too common.