The irrelevant information in whether old equipment should presently be used or replaced by new equipment is B) The book value of the old equipment.
Relevant information in decision-making is information that can guide the decision.
When deciding to purchase new equipment, the sunk costs of the old equipment are not relevant.
However, all future information, including the salvage value of the old equipment, cost savings, and cash price of the new equipment becomes relevant.
The irrelevant information in whether old equipment should presently be used or replaced by new equipment is B) The book value of the old equipment.
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