0. Duncan Manufacturing Company began operations on January 1, 2011. During the year, it started and completed 50 units. The company has the following transactions: 1) Acquired $30,000 cash by issuing common stock. 2} Paid $10,000 for materials. 3) Paid $6,000 for administrative salaries. 4] Paid $8,000 for wages of production workers. 5) Depreciation of ofce furniture $2,500. 6) Depreciation of manufacturing equipment $3,500. 7) Collected $20,000 in cash for sales of 45 units