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Each salesperson in a retail store is paid a commission based on the amount of his or her daily sales. For daily sales up to and including $200, the commission is $$r$$ percent of the daily sales. For daily sales over $200, the commission is $$2r$$ percent of the daily sales. On Friday, Amanda had daily sales of $300 and Bill had daily sales of $200. If the total of Amanda' s and Bill' s commissions on Friday was $40, what is the value of $$r$$?
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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。
