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Part 1
A music store bought a CD set at a cost of ​$10. When the store sold the CD​ set, the percent markup was ​%30
. Find the selling price.

To find the selling price, we need to calculate the percent markup based on the cost of the CD set and add that markup to the cost.

Markup = (Percent Markup / 100) * Cost
Markup = (30 / 100) * $10
Markup = $3

Selling Price = Cost + Markup
Selling Price = $10 + $3
Selling Price = $13

Therefore, the selling price of the CD set is $13.