David is designing a t-shirt for the choir pop show. The cost of printing is $400 plus $7.50 per shirt. What is the average total cost per shirt if 85 shirts are sold? Round to the nearest cent.

average cost ≈ $12.21 (nearest cent)

Step-by-step 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)