After dinner monday night, I had to get a few groceries. I was feeling obsessive so I decided I would calculate the exact grocery bill item by item and have the exact amount withdrawn from the eftpos with my card before the checkout operator had even finished scanning. Since this included bananas and tomatoes which are sold by the kilo ($7.98 @ $5.98 per kilo respectively) this was going to require accurate measurement. I decided I would take the average of two scales in the shop that were supposed to be accurate to the nearest 5 grams. For my 6 bananas one said 405g, the other 1.065kg(1), hmmm. After moving an obstruction on one of the scales they both measured about 1.060 kg. 5 tomatoes was .905 kg. After buying ten items (including prepacked smoked salmon on special at $49.90/kg) , I was confident I had it to $23.15 + or - 5 cents. Of course the checkout chick scanned it as fast as I could load it up, so my original plan was thwarted, and much to my surprise, the total was $22.15, exactly one dollar out. Suspiciously looking like a copying error on my part, I had a quick scan of the docket. Bananas 1.056 kg, fine. Tomatoes 0.705kg ? huh. Smoked salmon $5.49 (100g) instead of the advertised special of $4.99. I went to the service desk to claim my 50c ripoff, but low and behold, I got $5.50 back and the salmon. I had thought that "scan's wrong and it's free thing" had disappeared long ago from Coles. Apparently it still pays to meticulously check the docket. I didn't argue the toss on the tomatoes against my better judgement, assuming I misread my measurement, but I re-checked at home and my measurement was the correct one.
(1) That's $1.35 per banana - Almost Larry level. Still think Aus would be better off with free trade in bananas.