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Mathematics>Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
Three electricity plans are available in a certain county. The monthly usage and corresponding charges for that usage for three households, each using a different plan is shown below. Which plan, if any, has the lowest cost per kilowatt-hour (kWh)?
](http://pic.kekenet.com/2018/0207/64361517968851.png "SAT官方每日一题附答案和解析[数学](2018年2月7日)")
A.Plan A
B.Plan B
C.Plan C
D.The plans all cost the same amount per kilowatt-hour.
