A twelve-pack

A twelve-pack of juice costs $4.20. An eighteen-pack of juice costs $5.40. The eighteen-pack of juice is a better buy.
How much cheaper PER JUICE is the eighteen-pack?

Correct answer:

x =  0.05 USD

Step-by-step explanation:

a=4.20/12=207=0.35 USD b=5.40/18=103=0.3 USD  x=ab=0.350.3=0.05 USD



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