Percent Decrease Problems

Price of a Dress

Work Time

Price of a Dress

A sign on a dress in a store window says: “20% off! Sale price $40!” What was the price of the dress before the sale?

  • Copy and complete the table.
  • Write an equation.
  • Write the solution as a complete sentence.


  • Remember that the price has been decreased—not increased. What should you do differently in setting up the equation as compared to the way you set up an equation to represent percent increase?
  • Is the unknown amount the starting amount, the final amount, or the percent change? How can you represent the unknown amount in your equation?