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A grocery store sells a six pack of bottled water for 3.79 a nine pack or four. 50 and a 12 pack for 6.89 which package cost the least per bottle

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The 6 pack worth 3.79 costs $0.63 cents each bottle. The 9 pack for 4 is worth $0.50 cents the bottle. And the last on is worth $0.57 meaning the 9 pack for 4.50 costs the least per bottle.
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