Final answer:
To maximize profits for Andrea's Day Spa's aromatherapy treatment, one should calculate total revenue, marginal revenue, average cost, and marginal cost at each level of output, and find the output level where marginal revenue equals marginal cost.
Step-by-step explanation:
To determine the optimal charge for a relaxing aromatherapy treatment to maximize profits at Andrea's Day Spa, we must consider concepts from microeconomics. We need to calculate the total revenue, marginal revenue, average cost, and marginal cost at each level of output, using the given price and quantity from Table 10.5 and the total costs information. The profit-maximizing level of output is where marginal revenue equals marginal cost (MR=MC). We then calculate profits by subtracting total costs from total revenue at this output level. Without the specific data from Table 10.5, we cannot provide the exact numerical answer but can guide the student through the process.