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A plant's consumption is 2000 kWh a day when idle and 6000 kWh a day at full output of 100 t. Its marginal consumption is

  • A.80 kWh/t
  • B.40 kWh/t
  • C.60 kWh/t
  • D.20 kWh/t

Answer: B

Correct answer: 40 kWh/t

The marginal figure is the slope of the line between the two points: \[ \frac{6000 - 2000}{100} = 40\ \mathrm{kWh/t}. \] Dividing the full-output consumption by the output instead gives 60, which is the average specific consumption at full load and includes a share of the fixed load.

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