Webb, Inc. uses a flexible budget for manufacturing overhead based on machine hours. Variable manufacturing overhead costs per machine hour are as follows: Indirect labor Indirect materials Maintenance Utilities $5.00 2.50 .50 .30 Fixed overhead costs per month are: Supervision Insurance Property taxes Depreciation $1,200 400 600 1,800 The company believes it will normally operate in a range of 4,000 to 8,000 machine hours per month. During the month of August. 2019, the company incurs the following manufacturing overhead costs: