未分类题

What is the cost, in cents, of using a certain fax machine to send n pages of a report if the total cost for sending the first k pages is r cents and the cost for sending each additional page is s cents? (Assume that n>k. )
A.r+s (n-k)
B.r+s (n + k)
C.rs (n + k)
D.kr+s (n-k)
E.kr+ns

A.r+s
B.r+s
C.rs
D.kr+s

【参考答案】

A
解析:用某台传真机发送n页的报告,若最初k页总计费用为r美分,每额外多一张加收s美分,则以美分为单位使用该传......

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