Answer:
$0.59
Explanation:
Each water bottle was $2.69
Now it is 3 bottles for $6.30
If 3 bottles=$6.30 then each bottle must equal $2.10 ($6.30 divided by 3)
$2.10<$2.69 by how much?
well, $2.69-$2.10=$0.59
$0.59 is their difference.
for the promotion the cost is $0.59 less