Exercise 3-9 Applying Overhead to a Job [LO5] Sigma Corporation applies overhead cost to jobs on the basis of direct labor cost. Job V, which was started and completed during the current period, shows charges of $5,000 for direct materials, $8,000 for direct labor, and $6,000 for overhead on its job cost sheet. Job W, which is still in process at year-end, shows charges of $2,500 for direct materials and $4,000 for direct labor. Required: Calculate the overhead cost to be added to Job W at year-end. (Omit the "$" sign in your response.) Overhead cost $ ____________