- AThe unit's electricity tariff is to be revised in April
- BThe two rounds of saving measures were carried out by the unit's own staff
- CThe unit's electricity use rose in each of the five years before the two rounds began
- DThe two rounds consisted of relagging the steam lines and changing every lamp in the shed, which together account for very nearly the whole of what the unit's engineers had listed as recoverable, the remainder of the unit's use being the spinning frames themselves
Step-by-Step Solution
The manager is treating two years of falling use as a rate that will simply continue, but the two falls came from a fixed stock of savings that has now been spent. What is left is the electricity the frames must have in order to spin, and no third round can take twelve in every hundred out of that. A change in tariff alters the bill and not the units burnt; who did the work does not affect how much saving remains; and five earlier years of rising use tell us where the unit started, not what can still be saved.
Answer: D) The two rounds consisted of relagging the steam lines and changing every lamp in the shed, which together account for very nearly the whole of what the unit's engineers had listed as recoverable, the remainder of the unit's use being the spinning frames themselves