Pinnacle Corp. budgeted $263,370 of overhead cost for the current year. Actual overhead costs for the year were $245,620. Pinnacle's plantwide allocation base, machine hours, was budgeted at 54,340 hours. Actual machine hours were 55,170. A total of 100,630 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. $2.62 per machine hour Ob. $4.85 per machine hour Oc. $2.44 per machine hour Od. $4.52 per machine hour