Pinnacle Corp. budgeted $264,760 of overhead cost for the current year. Actual overhead costs for the year were $214,170. Pinnacle's plantwide allocation base, machine hours, was budgeted at 50,840 hours. Actual machine hours were 40,770. A total of 102,440 units was budgeted to be produced and 98,000 units were actually produced. Pinnacle's plantwide factory overhead rate for the current year is: a.$4.21 per machine hour b.$2.58 per machine hour c.$5.21 per machine hour d.$2.09 per machine hour