Final answer:
Closing Store B at Benner Stores would result in a net disadvantage of $70,000 per month when considering the saved traceable fixed expenses versus the lost contribution margin and the decreased sales in Store A.
Step-by-step explanation:
To determine the monthly financial advantage or disadvantage of closing Store B, we need to analyze the impact on the company's net operating income. We know that if Store B is closed, we save the variable expenses of $420,000 but also lose the sales of $600,000. However, if Store B's traceable fixed expenses are $200,000 and one-fourth will remain, then $150,000 of fixed expenses are saved. The remaining $50,000 would continue as a cost to Benner Stores. Additionally, we're informed that closing Store B would lead to a 10% decrease in Store A's sales, which currently amount to $400,000. This decrease in sales equals $40,000 (10% of $400,000).
As for the common fixed expenses, they are allocated based on sales, so with Store B's closure, all common fixed expenses would be reallocated to Store A. However, since the allocation basis is changing, not the total amount of common fixed expenses, initially, we'll disregard this in the advantage/disadvantage calculation.
To calculate the net change to overall profit, we combine the loss of contribution margin from Store B ($180,000), the reduced sales in Store A ($40,000), and the saved traceable fixed expenses ($150,000).
Change in profit = Saved traceable fixed expenses - (Loss of Store B's contribution margin + Decreased sales in Store A)
= $150,000 - ($180,000 + $40,000)
= $150,000 - $220,000
= -$70,000
Thus, closing Store B would result in a disadvantage of $70,000 per month.