Final answer:
The Rowe Company should report $18 as revenue, as U.S. GAAP dictates that only the amount the customer is charged for the food counts as revenue, not including tips.
Step-by-step explanation:
The Rowe Company should report $18 in revenue according to U.S. GAAP. In this scenario, tips are not considered revenue for the restaurant but are rather a direct transaction between the customer and the waitress. Therefore, only the amount charged for the product or service, which is the cost of the steak ($18), is recorded as revenue on the restaurant's books.
It's important to distinguish between the cost of goods sold (COGS) and operating expenses, such as the chef's wage ($2) and the waitress's wage ($1), which do not directly affect the revenue figure. The payment method, whether cash or credit, does not impact the revenue recognition.