Final answer:
The markup price for the shirts is $14,600.
Step-by-step explanation:
The markup price can be calculated by subtracting the cost price from the selling price. In this case, the cost of buying 300 shirts is $5,400, and the selling price of each shirt is $20.
Markup = Selling price - Cost price
Markup = $20 - $5.400
Markup = $14,600
Therefore, the markup price is $14,600.