Answer:
average cost ≈ $12.21 (nearest cent)
Explanation:
The cost of printing the shirt is $400 plus $7.50 per shirt. The cost for producing the shirt requires a flat rate of $ 400 plus an additional $7.50 for each shirt.
Let
x = number of shirt
total cost = 400 + 7.50(x)
The number of shirt sold = 85
The average cost per shirt can be calculated as follows when he sold 85 shirts.
Average cost = total cost/number of shirt
total cost = 400 + 7.50(x)
total cost = 400 + 7.50(85)
total cost = 400 + 637.50
total cost = $1037.5
number of shirt = 85
average cost per shirt = 1037.5/85
average cost = 12.205882353
average cost ≈ $12.21 (nearest cent)