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? a. $18 b. $31.50 c. $27 d. $40.50