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Part 1
A music store bought a CD set at a cost of $20. 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 amount of markup and add it to the cost of the CD set.
First, we find the amount of markup by multiplying the cost by the markup percentage in decimal form:
Markup = cost * markup percentage
Markup = $20 * 0.30
Markup = $6
Next, we add the markup to the cost to find the selling price:
Selling price = cost + markup
Selling price = $20 + $6
Selling price = $26
Therefore, the selling price of the CD set is $26.