12*$.73=$8.76-$7.68=$1.08 So it is $1.08 cheaper to buy it by the case.
Hope that helps.
Finding three volume is super easy the equation for volume is the area of the base times the height so u will find the area of all the small part and then add those and then multiply by the height
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Step-by-step explanation:

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Here you go ! Hope it helps.