Final answer:
To find the number of shirts sold when the cost is the same, we need to set up an equation and solve for x.
Step-by-step explanation:
To find the number of shirts sold when the cost is the same, we need to set up an equation and solve for x, where x represents the number of shirts sold. Let's start by setting up the equation:
8x + 13 = 7.50x + 16
Combine like terms:
0.50x = 3
Divide both sides by 0.50 to isolate x:
x = 6
Therefore, after selling 6 shirts, the cost will be the same for Cool Shirts and Total Tees. Since none of the given options match the answer, we can conclude that the correct answer is not provided in the options given.