9: Boat Club of Muscat provides live-aboard houseboats for cruising on the sea. The company bases its overhead cost budgets on the following data: Variable overhead costs: Cleaning... Maintenance. Park usage fees. Fixed overhead costs: Salaries and wages. Depreciation. Utilities.. Moorage. .$72.50 per charter . $56.25 per charter $15.75 per charter $7,860 per month . $13,400 per month $720 per month $3,670 per month Each time a boat is chartered, whether it is for one day or a week, certain costs must be incurred. Those costs are listed above under the variable overhead costs. For example, each time a boat returns from a charter, it must be thoroughly cleaned, which costs $72.50 on average. In December 2020, the following actual costs were incurred for 140 charters: Cleaning... Maintenance. Park usage fees . $10,360 $7,630 $2,210 Salaries and wages $7,855 Depreciation.. $14,450 Utilities $735 Moorage. $3,950 Due to an unanticipated surge in demand for charters, the company purchased a new boat in December to add to its charter fleet. Required: 1. Construct a Flexible Budget Performance Report for Boat Club of Muscat, Charter Service for December. 2. What is apparently the major cause of the total overall overhead variance for the month? Explain