Sineath Industries had a fire and some of its accounting records were destroyed. Available information is presented below for the year ended December 31, 2011. Additional information is as follows: Factory overhead is 150% of direct labor cost. Finished goods inventory decreased by $18,000 during the year. Work in process inventory increased by $12,000 during the year. What is the a) materials inventory, January 1, 2011 and b) direct labor cost ? a. $10,000 and $49,700 b. $9,900 and $49,640 c. $10,400 and $50,400 d. $9,975 and $50,000