Alibaba Group Holding Limited has beginning work in process inventory of $80,000 and ending work in process inventory of $100,000. During the period, direct materials used were $200,000, direct labor cost was $150,000, and manufacturing overhead incurred was $120,000. Calculate: a) The cost of goods manufactured. b) The total manufacturing costs incurred. c) The cost of goods sold. d) The gross profit. e) Discuss how variations in manufacturing costs can impact the company's profitability.