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Hi,so I want to buy cat food boxes,but I've forgotten how to calculate this,I keep getting stuck! There is an offer on boxes,each box costs $14.90 and the offer is buy 2 get 1 free (3 for the price...

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HiIt would be great if someone could read through my calculation to see if I did it right.I made up the question to solve a real-world problem so have no answer to compare it to...Question-> 100ml ...