Well if its 1.25 per pound... and if there are 5 tomatoes total that weigh 1.80 lb... Then you would do the following:
1.25 (price per pound) multiplied by 1.80 (total of pounds) Then that equals out to a total of: 2.25
So, that would be your total. 2.25
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Hope this helps! :)
Anymore questions, please feel free to ask!