Pinnacle Corp. budgeted $700,000 of overhead cost for the current year. Actual overhead costs for the year were $650,000. Pinnacle's plantwide allocation base, machine hours, was budgeted at 100,000 hours. Actual machine hours were 80,000. A total of 100,000 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.$6.50 per machine hour

b.$7.00 per machine hour

c.$8.75 per machine hour

d.$8.13 per machine hour