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National brand of cough medicine costs $12, what is the cost of the store brand? S=2/3N

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Okie, so more information might be needed. What is S and what is N. I will assume that the price of the store brand is 2/3(national brand). In this case, you plug in the the national brand price.
2(12)/3 = 24/3 = $8
I hope this helps :-)
User Habibun
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