Final answer:
To find the percent markup, subtract the total cost from the total selling price and divide by the total cost, then multiply by 100%. The percent markup is 25%, corresponding to option D.
Step-by-step explanation:
To find the percent markup, we need to first determine the total cost and the total selling price of the shirts.
Total cost = number of shirts bought × cost per shirt = 300 × $2,400 = $720,000
Total selling price = number of shirts sold × selling price per shirt = 300 × $10 = $3,000
Now we can calculate the percent markup using the following formula:
Percent markup = (Total selling price - Total cost) ÷ Total cost × 100%
Percent markup = ($3,000 - $2,400) ÷ $2,400 × 100% = $600 ÷ $2,400 × 100% = 0.25 × 100% = 25%
Therefore, the percent markup is 25%, which corresponds to option D.