Answer:
A. $4.76
Explanation:
This case is fairly typical of average cost problems. There is some fixed cost that is amortized over the number of T-shirts produced, and there is some variable cost associated with each item.
Here, if you divide out the equation, you get ...
A = 4.75 + 125/x
Then for x=10,000, the value of A is ...
A = 4.75 +125/10,000 = 4.75 +0.0125 ≈ 4.76
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Once you see that the fixed cost of $125 is divided by 10,000, you can look for an answer choice that is very slightly higher than $4.75.