The king corporation manufactures custom-made furniture. the following data pertains to job x4a: direct materials placed into production $9,000 direct labor hours worked 300 hours direct labor rate per hour $15 machine hours worked 100 hours plantwide overhead rate is $22.50 per machine hour. job x4a consists of 500 units. one-half of job x4a was sold for $10,000. what is the cost per unit for job x4a?