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Expression of IdeasHardComparing two options on a key point

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A town can buy electric buses or diesel buses. - Electric buses cost $500,000 each; diesel buses cost $300,000. - Electric buses cost $20,000 a year less to run. - Buses are kept for 12 years. The student wants to compare the two options over the life of a bus.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Although an electric bus costs $200,000 more to buy than a diesel one, it saves $20,000 a year in running costs, so over 12 years it costs $40,000 less in total.Correct
  2. B. Electric buses cost $500,000 each.
  3. C. Electric buses cost $20,000 a year less to run.
  4. D. Buses are kept for 12 years.

Answer: A. Although an electric bus costs $200,000 more to buy than a diesel one, it saves $20,000 a year in running costs, so over 12 years it costs $40,000 less in total.

Purchase gap against running savings over 12 years.

Why the other answers are wrong

B. Electric buses cost $500,000 each.
One price.
C. Electric buses cost $20,000 a year less to run.
The saving without the comparison.
D. Buses are kept for 12 years.
Lifespan alone.

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