2. 外语
  3. The cost, in dollars, for an appliance repair at a certain company is 1.2p + 20h, where p is the wholesale price of the parts, i

The cost, in dollars, for an appliance repair at a certain company is 1.2p + 20h, where p is the wholesale price of the parts, i

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问题 The cost, in dollars, for an appliance repair at a certain company is 1.2p + 20h, where p is the wholesale price of the parts, in dollars, and h is the number of hours it takes to repair the appliance. What is the cost of repairing an appliance if the wholesale price of the parts is $15 and it takes 2 hours to repair it?
选项 A、$12
B、$18
C、$20
D、$40
E、$58
答案E
解析 某公司一设备的修理成本，以美元计，为1.2p+20h，其中p是零件的批发价格(以美元计)，h是修理设备所用的小时数。如果零件的批发价是15美元，并且花了2小时修理，那么修理这个设备的成本是多少?
解：本题的正确答案为(E)。解答该题时，只要把数据代入题中所给的公式即可：1.2×15+2×20=58
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