Runcke Motor Company manufactures automobiles. During September 2011 the

company purchased 5,000 head lamps at a cost of $9 per lamp. Runcke withdrew 4,650

lamps from the warehouse during the month. Fifty of these lamps were used to replace

the head lamps in autos used by traveling sales staff. The remaining 4,600 lamps were

put in autos manufactured during the month.

Of the autos put into production during September 2011, 90% were completed and

transferred to the company