Pinnacle Corp. budgeted $247,070 of overhead cost for the current year. Actual overhead costs for the year were $201,980. Pinnacle's plantwide allocation base, machine hours, was budgeted at 49,590 hours. Actual machine hours were 58,860. A total of 90,190 units was budgeted to be produced and 98,000 units were actually produced. Pinnacle's plantwide factory overhead rate for the current year is: Oa. $4.07 per machine hour Ob. $2.74 per machine hour Oc. $2.24 per machine hour Od. $4.98 per machine hour