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Marina's total monthly salary consists of a base monthly salary of $400 plus a commission equal to 10 percent of her sales up to a certain amount and a commission of 20 percent on any additional sales in excess of that amount. Last month Marina's sales were $12,000, and her total monthly salary was $2,000. What is the amount of sales at which the commission rate changes from 10 percent to 20 percent?
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2.5.6 分段函数及应用题
2.5.6 分段函数及应用题
以上解析由 考满分老师提供。
