The shampoo you like to use is on sale. But you only get the lower price if you buy 3 bottles...?
...You want to know how much you'll save
What is the formula?
s=sales price per bottle
r=regular price per bottle
c=cost savings

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c=3r-3s
3, since you buy 3 bottles. c is the total cost savings.

it will be c= 3(r-s)

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