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# A supermarket charges \$4.50 for eight cans of cat food, at the same rate how much would 28 cans of cat food cost?

\$4.50*8=36.00, 36.00*8=

### 3 Answers by Expert Tutors

Francisco E. | Francisco; Civil Engineering, Math., Science, Spanish, Computers.Francisco; Civil Engineering, Math., Sci...
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You have to obtain the unit value per can which is
4.50/8
Then obtain the value for the 28
(4.5/8)*28 = 15.75
Stephen K. | Physics PhD experienced in teaching undergraduatesPhysics PhD experienced in teaching unde...
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Catherine,

You need to find the price for (8 + 8 + 8 + 4) = 28 cans of cat food.

This works out to (3 x \$4.50) + 4 x (\$4.50/8) = (3 x \$4.50) + (\$4.50/2) = \$13.50 + \$2.25 = \$15.75
Philip P. | Effective and Affordable Math TutorEffective and Affordable Math Tutor
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The \$4.50 is for all 8 cans of cat food, so the cost for each can is:

\$4.50/8 = \$0.5625 per can    [56.25 cents per can)

So for 28 cans:

(\$0.5625 per can)*(28 cans) = \$15.75

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Another way to do it is to set up a proportion:

\$4.50/8 = \$x/28

Solve for x - same answer as above.