Answer:
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.