A 60 ounce glass bottle of juice sells for $4.20 while a 1.5 liter of the same juice sells in a plastic bottle for $3.06. Compare the unit prices of the juice for the two containers. (1 liter is approximately 34 ounces)

The glass bottle costs $4.20 ÷ 60 = $0.07 per ounce. The plastic bottle holds about 1.5 × 34 = 51 ounces, so its unit price is $3.06 ÷ 51 = $0.06 per ounce. Therefore, the plastic bottle is 1 cent cheaper per ounce, matching choice b.

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