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  3. 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

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

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问题 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. )
选项 A、r+s (n-k)
B、r+s (n + k)
C、rs (n + k)
D、kr+s (n-k)
E、kr+ns
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真机发送n页报告需多少钱?(假设n>k)
解：本题的正确答案为(A)。最初k页总共花r美分，其余(n-k)张共花s(n-k)美分，因此发n页共需r+s(n-k)美分。
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