听力原文:W: There are so many children at the school. I wonder how the teacher keeps track of them. M: I used to get cold feet at the thought of teaching a class of 50. Q: What was the man's attitude toward teaching? (18)
【单选题】If the CIF price of a product is USD 100/set, freight charge USD15/set, insurance premium USD15/set, commission rate 2% , the commission payment based on CIF price should be______.