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Answered

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

Verified Answer :

meerkat18

The sale price of 3 bottles of shampoo is 3s and the regular price is 3r. The amount of money you save will only come in when you buy 3. The cost you save is the difference between the regular price and the sale price. The equation is therefore,
                         c = 3r - 3s

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