Marty paid $72 for a jacket that had been marked down 20%. Calculate the original price of the jacket.

The original price was $90.

Step-by-step explanation:

Let j represent the original price.  Then, subtract 20% from 100%, obtaining 80%.  The markdown price is 80% of j, or 0.80j = $72

Solving for j, we get j = $72/0.80 = $90

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