AMC10 2000 A

AMC10 2000 A · Q4

AMC10 2000 A · Q4. It mainly tests Linear equations, Systems of equations.

Chandra pays an on-line service provider a fixed monthly fee plus an hourly charge for connect time. Her December bill was $12.48, but in January her bill was $17.54 because she used twice as much connect time as in December. What is the fixed monthly fee?

Chandra向在线服务提供商支付固定的月费加上按小时计费的连接时间费。她的12月账单是$12.48，但1月账单是$17.54，因为她1月的连接时间是12月的两倍。固定的月费是多少？

(A) $2.53 $2.53

(B) $5.06 $5.06

(D) $7.42 $7.42

(E) $8.77 $8.77

Answer

Correct choice: (D)

正确答案：（D）

Solution

Answer (D): Since Chandra paid extra \$5.06 in January, her December connect time must have cost her \$5.06. Therefore, her monthly fee is \$12.48 – \$5.06 = \$7.42.

答案（D）：由于 Chandra 在一月份多付了 \$5.06，她十二月份的连接时长费用一定是 \$5.06。因此，她的月费为 \$12.48 – \$5.06 = \$7.42。

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