I use my calculator to figure which product is the better deal when there are multiple brands, sizes, and units of measure on the sizes. I don't have a budget to stick to when shopping, so I don't need to keep a running total before check-out. I always pay for groceries with credit card, so there is no issue of my total exceeding the cash I have on me. Of course, I don't recommend everyone have no budget for groceries. It work for us, but we are very careful with the spending.
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