How easy is it to use unit pricing in the supermarket?

The one that threw me was tea bags. I was after some green tea one day and did the comparison between each of the brands. The UOM in this case was per tea bag so I grabbed the cheapest one. However I later found out that the ones that I bought had less tea in the bag than some of the others. So in hindsight the UOM should realistically be by weight and not per bag.

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