Expression of IdeasHardSynthesis: value of a bridge over the long term
Expression of Ideas practice question
While researching a topic, a student has taken the following notes:
- Design A: a steel arch costing 40 million, taking 3 years to build, with a lifespan of 100 years.
- Design B: a concrete beam costing 25 million, taking 2 years to build, with a lifespan of 50 years.
The student wants to argue that Design A is better value over the long term. Which choice most effectively uses relevant information from the notes to accomplish this goal?
- A. Although Design A costs 15 million more, it lasts twice as long as Design B, so it costs less for each year of use.Correct
- B. Design B costs 25 million and takes 2 years to build.
- C. Design A is a steel arch.
- D. Design A takes a year longer to build than Design B.
Answer: A. Although Design A costs 15 million more, it lasts twice as long as Design B, so it costs less for each year of use.
Cost per year of use.
Why the other answers are wrong
- B. Design B costs 25 million and takes 2 years to build.
- Favours B, if anything.
- C. Design A is a steel arch.
- Material, not value.
- D. Design A takes a year longer to build than Design B.
- A point against A.
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