请教ASQ考试题目

题目如下：

Machine A produces 6 defective parts for every 1000 parts produced and the cost to isolate these parts is $100. For every 10 parts produced, there is $1 of non-recyclable scrap material created. The costs of labor for each batch of 1000 parts is $500. What is the internal failure cost of this 1000 batch process?
A. 100
B. 500
C. 600
D. 700

答案为C
我的问题是人工成本是否要计算其中？

谢谢