Pinnacle Corp. budgeted $248,710 of overhead cost for the current year. Actual overhead costs for the year were $207,620. Pinnacle's plantwide allocation base, machine hours, was budgeted at 53,450 hours. Actual machine hours were 58,650 . A total of 90,260 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. $2.30 per machine hour b. \$2.76 per machine hour c. $3.88 per machine hour d. \$4.65 per machine hour