1. Granite Company uses a job-order costing system. The company applies manufacturing overhead to jobs using a predetermined overhead rate based on direct labor-hours. Last year, manufacturing overhead and direct labor-hours were estimated at $80,000 and 16,000 hours respectively, for the year. At the end of the year, it was determined that the company actually worked 15.000 direct labor-hours for the year, and incurred $78,000 in actual manufacturing overhead costs. In June, Job #315 was completed. Materials costs on the job totaled $1.500 and labor costs totaled $2.400. There were 400 direct labor hours worked on Job #315. a. Determine the predetermined overhead rate for the year. b. Determine the amount of overhead charged to all jobs during the year (in total), and write the journal entry to apply overhead. c. Determine the amount of underapplied or overapplied overhead for the year, and write the journal entry to close the manufacturing overhead account assuming this amount was immaterial. d. Assuming that 100 units were completed, determine the total product cost and the per unit product cost that would appear on the job cost sheet for Job #315