Pinnacle Corp. budgeted $242,890 of overhead cost for the current year. Actual overhead costs for the year were $226,970. Pinnacle's plantwide allocation base, machine hours, was budgeted at 49,680 hours. Actual machine hours were 52,500. A total of 99,660 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. $2.44 per machine hour b. $4.89 per machine hour c. $4.57 per machine hour d. $2.28 per machine hour