Final answer:
The subject of this question is Business and it involves understanding costs, pricing strategies, and profit margins in a business setting.
Step-by-step explanation:
The subject of this question is Business. The store employee is noticing a discrepancy between the cost of tables and their selling price. This highlights the concept of pricing, cost analysis, and profit margin in a business setting.
To calculate the profit margin, we subtract the cost from the selling price. In this case, the profit margin is $63 - $50 = $13.
This situation demonstrates the importance of understanding costs, pricing strategies, and profit margins in running a successful business.