Pinnacle Corp. budgeted $258,710 of overhead cost for the current year. Actual overhead costs for the year were $208,620. Pinnacle's plantwide allocation base, machine hours, was budgeted at 52,610 hours. Actual machine hours were 51,400. A total of 95,080 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.$3.97 per machine hour

b.$2.72 per machine hour

c.$4.92 per machine hour

d.$2.19 per machine hour