Target sells 24 bottles of water for $3, and 36 bottles of water for $4. which is the better buy and by how much?
a) 24 bottles for $3 by 1.5¢ per bottle
b) 24 bottles for $3 by 70¢ per bottle
c) 24 bottles for $3 by 75¢ per bottle
d) 36 bottles for $4 by 1.4¢ per bottle

The better buy is option C because you will be paying $3 instead of $18 for 24 bottles. Which means you will save $1.2 more than option B and $15 in total.

Step-by-step explanation:

Option A:

If the bottle is 1.5 cent per bottle and you buy 24 bottles you will only spend:

therefore only 36 cent.

Option B:

If the bottle is 70 cent per bottle and you buy 24 bottles you will only spend:

therefore you will pay $16.8.

Option C:

If the bottle is 75 cent per bottle and you buy 24 bottles you will only spend:

therefore you will pay $18.

Option D:

If the bottle is 1.4 cent per bottle and you buy 36 bottles you will only spend:

therefore you will pay 50 cent.

∴ Option A you will overspend $3-0.36cents = $2.64

∴ Option B you will save $16.8-$3 = $13.8

∴ Option C you will save $18-$3 = $15

∴ Option B you will overspend $3-$0.5 = $2.5

Therefore option C is the best option because you will be paying $3 instead of $18 for 24 bottles. You will save $1.2 more than option B.

stops on an even number.

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step-by-step