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请教GWD30-27

Q27

For each landscaping job that takes more than 4 hours, a certain contractor charges a total of r dollars for the first 4 hours plus 0.2r dollars for each additional hour or fraction of an hour, where r > 100.  Did a particular landscaping job take more than 10 hours?

(1)     The contractor charged a total of $288 for the job.

(2)     The contractor charged a total of 2.4r dollars for the job. 

Answer : B

请教思路  谢谢

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嗯嗯 谢谢你 分析的很清楚.

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