Final answer:
The Sure-Screen T-Shirt Company is producing 500 t-shirts, based on information from the provided examples about T-shirt pricing and sales.
Step-by-step explanation:
In the short run, the Sure-Screen T-Shirt Company is producing 500 t-shirts. This is evident from the information provided, where references to T-shirt pricing, cost, and examples of T-shirt sales are consistently mentioned. T-shirts are frequently used in examples to demonstrate economic principles, such as budget constraints and the trade-offs consumers might make, such as José's decision between purchasing movies and t-shirts, where the price of a T-shirt is indicated to be $14.