Calculate the amount of gross margin on the income statement.

April 1 Inventory balances. Raw materials Work in process Finished goods April 30 Inventory balances Raw materials Work in process Finished goods During April Costs of raw materials purchased Costs of direct labor Costs of manufacturing overhead Sales revenues $100,000 120,000 78,000 $ 60,000 145,000 80,000 $120,000 100,000 63,000 380,000