Can you explain this general accounting question using accurate calculation methods?

Carver Manufacturing uses a job-order costing system. The company uses a plantwide predetermined overhead rate based on machine- hours. At the beginning of the year, the company made the following estimates: Estimated machine-hours: 80,000 Estimated fixed manufacturing overhead: $520,000 Estimated variable overhead per machine-hour: $4.50 What is Carver's predetermined overhead rate per machine-hour