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)?
D.The plans all cost the same amount per kilowatt-hour.
Choice A is correct.