Answer:
$7.50
Step-by-step explanation:
4 bottles of water cost $10, meaning that each bottle costs $2.50 (10/4 = 2.5). If 3 bottles are bought and each bottle costs $2.50, the total cost is $7.50 (3*2.5 = 7.5).
$8.40
You multiply $12 by 0.7 and get $8.40
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