题目：
Given the following information about a firm: Net Sales = $1000 Cost of Goods Sold = $ 600 Operating Expenses = $ 200 Interest Expenses = $ 50 Tax Rate = 34% What are the gross and operating profit margins Gross Operating Margin Operating Profit Margin（）①A. 2O% 15% ②B. 4O% 10% ③C. 40% 20%
A. ①
B. ②
C. ③
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
。剩下的木材全部用来做椅子，还可以做（）把。