Answer:Here's how to solve the problem: 1. Identify the total cost: The Monteylegre family charged $11,746.73 for the birthday party. 2. Identify the number of persons: The problem states the charge was for "a jaunty of in persons," but it doesn't specify the exact number of people. Let's represent the unknown number of persons as 'n'. 3. Calculate the average cost per person: The average cost per person is calculated by dividing the total cost by the number of persons. Therefore, the formula is: Average cost per person = Total cost / Number of persons Average cost per person = $11,746.73 / n 4. The answer: Without knowing 'n' (the number of persons), we cannot calculate the exact average cost per person. The average cost per person is $11,746.73 / n. To get a numerical answer, you need to provide the number of people at the party.