A puppy is on sale at a pet store for ​$351​, marked down 10​% from an original selling price of

A puppy is on sale at a pet store for ​$351​, marked down 10​% from an original selling price of ​$390. If the markup from cost to sale price was ​$81​, what was the​ cost? Use pencil and paper. How would you solve the problem if you were not given the sale​ price?


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