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Part 1
During a​ sale, a dress is marked down from a selling price of ​$90 to a sale price of ​$63. What is the percent​ markdown?

To find the percent markdown, we need to calculate the difference between the original selling price and the sale price, and then divide that difference by the original selling price.

Difference: $90 - $63 = $27

Percent markdown: ($27 / $90) * 100% ≈ 30%

Therefore, the percent markdown is approximately 30%.