英语数学，苦手！！！

A utility company measures gas consumption by the hundred cubic feet, CCF.The company has a three-step rate schedule for gas customers.First, there is a minimum charge of $5.00 per month for up to 3 CCF of gas used.Then,for the next 6 CCF,the charge is $0.75 per CCF.Finally,after 9 CCF,the charge is $0.55 per CCF.Represent the cost of g CCF of gas if g is greater than 9.

谁帮忙做下。头大。

解：5+0.75*6+0.55*（g-9）即为当g大于9CCF时所应付的数额。

5g；

5g+0.75*6+0.55（g-9）

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