To produce 10 shirts,the total cost is $80; to produce 11 shirts,the total cost is $99.The average total cost of the 11th shirt is equal to

Question

Quizplus · Accepted Answer

To find the average total cost of the 11th shirt, we need to find the cost of the 11th shirt separately. 
Let the cost of the 11th shirt be x. 
From the given information, 
10 shirts cost $80 
1 shirt costs $80/10 = $8 
Therefore, the cost of the 11th shirt and 10 shirts together is $99 
10 shirts cost $80, 
So the cost of the 11th shirt and 10 shirts is $80 + x 
Therefore, 
$80 + x = $99 
x = $99 - $80 = $19 
Hence, the average total cost of the 11th shirt is $19/1 = $19. The answer is B.

To Produce 10 Shirts,the Total Cost Is $80; to Produce