Brief Exercise 4-25 Convert Departmental Data to Plantwide Data, Plantwide Overhead Rate, Apply Overhead to Production Refer to the information in Brief Exercise 4-24 for data. Now, assume that Hallett has decided to use a plantwide overhead rate based on direct labor hours. OB Exa Required: 1. Calculate the predetermined plantwide overhead rate. (Note: Round to the nearest cent.) 2. Calculate the overhead applied to production for the month of June. 3. Calculate the overhead variance for the month of June