Job A3B was ordered by a customer on September 25. During the month of September, Jaycee Corporation requisitioned $3,500 of direct materials and used $5,000 of direct labor. The job was not finished by the end of September, but needed an additional $4,000 of direct materials in October and additional direct labor of $7,500 to finish the job. The company applies overhead at the end of each month at a rate of 100% of the direct labor cost. What is the amount of job costs added to Work in Process Inventory during October?