题目信息
A salesperson received a 6-percent commission on the amount of total sales up to and including $10,000, and an r-percent commission on the amount of total sales over $10,000. If the salesperson received a total commission of $920 on total sales of $14,000, what was the value of r?
A:3.2
B:4.3
C:6.6
D:8.0
E:9.2
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正确答案：
D:8.0
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