Well, it happens here in Montreal as well..I went to a fabric store and they had an assortment of wallpaper borders on sale...end lots...and I thought I would pick up some because they were only 2 for 75 cents....so I picked up 8......I got to the cash and the girl at the cashier said she didnt know what the price was - I told her that the price was written on the box where the borders where....2 for 75 cents..and she just looked at me with a blank face - I asked her what was wrong - so I asked if she undertood the price - 2 for 75 cents - she said 'yes, I know that they are 2 for 75 cents but you bought 8'..I said yes - whats the problem with that - she said well I dont know how to calculate that when it,s 2 for 75 cents and you have 8..I said what about we separate them in twos on the counter - which I did - and then showed her that there were 4 groups of 2 - and that would be 75 cents each group of 2 x 4 groups, etc. etc...and she said to me 'I have a university degree but I never was good in math'..I though I would crumble at the counter...I couldnt wait to get out of there....that scared me......
But afterwards, the fustration wore of and I got such a kick out of it..I did get everything for the right price but they should have paid me a half hours wages for working at the store.. 'smile'