medium · GMAT Verbal Reasoning
To reduce energy costs, a manufacturing plant plans to replace its aging ventilation system with a high-efficiency model that consumes 30 percent less electricity. The plant managers conclude that this switch will result in a 30 percent reduction in the plant's total monthly utility expenditure.
Which of the following, if true, most seriously weakens the argument?
- The new ventilation system requires more frequent and expensive professional maintenance than the old system did.
- The ventilation system accounts for only 10 percent of the plant's total monthly electricity consumption.
- The plant recently installed a separate solar power array that provides 5 percent of its daily energy needs.
- Electricity rates in the region where the plant is located are expected to rise significantly next year.
- Installing the new system will require the plant to shut down production for two full days.
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