Expression of IdeasHardSynthesis: heating costs over twenty years
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- A gas boiler costs 3,000 to install and 900 a year to run.
- A heat pump costs 9,000 to install and 500 a year to run.
The student wants to argue that the heat pump costs less over twenty years. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Over twenty years the heat pump costs 19,000 in total against the boiler's 21,000, despite costing three times as much to install.Correct
- B. The heat pump costs 9,000 to install.
- C. The gas boiler costs 900 a year to run.
- D. The gas boiler is cheaper to install than the heat pump.
Answer: A. Over twenty years the heat pump costs 19,000 in total against the boiler's 21,000, despite costing three times as much to install.
Totals over twenty years.
Why the other answers are wrong
- B. The heat pump costs 9,000 to install.
- A cost against the pump.
- C. The gas boiler costs 900 a year to run.
- One figure, no comparison.
- D. The gas boiler is cheaper to install than the heat pump.
- A point for the boiler.
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