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44 votes
A 20 ounce box of cereal costs $3.20. A 12 ounce box of cereal costs $1.80. Which box of cereal is the better buy?

answer choices
A- 20 ounce box
B- 12 ounce box

User Mamoo
by
2.7k points

1 Answer

25 votes
25 votes

Answer:

B- 12 ounce box

Explanation:

You want to know which box of cereal is a better buy:

A- 20 ounces for $3.20

B- 12 ounces for $1.80

Comparison

There are several ways to compare prices. One is to find the unit price (price for 1 ounce) as in the attachment. This tells you the unit price for a 20-ounce box ($0.16/oz) is more than the unit price for a 12-ounce box ($0.15/oz).

The better buy is B- 12 ounce box.

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Additional comment

You can also use common multiples or common factors of the quantities to compare prices for the same quantity:

60 ounces of cereal = 3 20-oz boxes for $9.60, or 5 12-oz boxes for $9.00

2 ounces of cereal = 1/10 of a 20-oz box for $0.32, or 1/6 of a 12-oz box for $0.30

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A 20 ounce box of cereal costs $3.20. A 12 ounce box of cereal costs $1.80. Which-example-1
User Dastrobu
by
3.0k points