Question 253923
Here's the question 
It costs $350 for a case of 150 jars of modeling clay. It costs $672 for a case of 450 jars of modeling clay. 

What is the unit price for a jar in the case of 150 jars? 

What is the unit price for a jar in the case of 450 jars? 
Which case of jars of modeling clay is the better buy? 
Please help me set up the proportion and answer.
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You have two points: (150,350) and (450,672)
slope: (672-350)/(450-150) = 322/300 = 1.073
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What is the unit price for a jar in the case of 150 jars?
350/150 = $2.333333
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What is the unit price for a jar in the case of 450 jars?
672/450 = $1.49333..
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Which case of jars of modeling clay is the better buy? 
The case with 450 jars is the better buy.
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Cheers,
Stan H.