Answer:The answer is in the explanatory column
Explanation: The items considered relevant and irrelevant for Barnum Enterprise to make decision whether to replace or not is given
1. Orginal cost of computer being considered for replacement----Relevant
2. Accumulated depreciation taken on old computer being considered for replacement-----Irrelevant
3. Estimated annual operating costs of the new computer being considered for purchase---- Relevant
4.Trade-in value received for old computer being considered for replacement----- Irrelevant
Any Costs that were incurred in the past and cannot be changed is irrelevant and termed sunk costs.
Expected future costs which differ among alternatives are relevant and should be considered