4-24 Budgeted manufacturing overhead rate, allocated manufacturing overhead. Gammaro Manufacturer uses normal costing. It allocates manufacturing overhead costs using a budgeted rate per machine-hour. The following data are available for 2020: Budgeted manufacturing overhead costs Budgeted machine-hours Actual manufacturing overhead costs Actual machine-hours 1. Calculate the budgeted manufacturing overhead rate. 2. Calculate the manufacturing overhead allocated during 2020. $4,600,000 184,000 $4,830,000 180,000 3. Calculate the amount of under- or overallocated manufacturing overhead. Why do Gammaro's manag- ers need to calculate this amount?