$17.50
Explanation:
You first divide 30 by 12, which is equal to 2.5, so then you multiply 2.5 by 7 because it is the amount of cans you're buying (2 x 7 = 14) (0.5 x 7 = 3.5). So the answer is 17 dollars 50 cents or 17.5.
Answer: $17.50
30 divided by 12 equals 2.5 therefor you would multiply 2.5 by the number of cans purchased, in this case 7.
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