Walter Company uses a job-order costing system to account for product costs. The following information pertains to the current year: Materials placed into production $140,000 Indirect labor 40,000 Direct labor (10,000 hours) Depreciation of factory building Other plantwide overhead Increase in work-in-process inventory 160,000 60,000 100,000 30,000 Plantwide overhead rate is S18 per direct labor hour What is the total amount credited to Materials Inventory for Walter in the current year? $480,000 $170,000 $140,000 - s110,000