Final answer:
To discontinue the City Division's operations, the differential revenues are the sales revenue of $8,600,000, and the differential costs are the advertising cost, City Division administrative salaries, selling costs, and rent cost. If the division is eliminated, Betty's profits will increase by $126,000.
Step-by-step explanation:
To determine which revenues and costs are differential for the decision to discontinue City Division's operations, we need to identify the costs and revenues that would change if the division is eliminated. Differential revenues are those that are unique to the City Division and will no longer be generated if it is shut down. In this case, the sales revenue of $8,600,000 is a differential revenue. Differential costs are those costs that are specific to the City Division and would no longer be incurred if it is shut down. In this case, the advertising cost of $350,000, the City Division administrative salaries of $580,000, the selling costs of $1,160,000, and the rent cost of $1,470,000 are all differential costs.
If the City Division is eliminated, Betty's profits will increase by $(210,000 - 84,000) = $126,000. This is because the City Division is currently operating at a net loss of $(126,000) before income tax benefit. By shutting down the division, the company would no longer incur the loss, resulting in a net increase in profits.