Saved Help Save & B The management of Casablanca Manufacturing Corporation believes that machine-hours is an appropriate measure of activity for overhead cost. Shown below are machine-hours and total overhead costs for the past six months: Machine- Hours Overhead Cost Jan 150,000 $339,000 Feb 140,000 $328,000 Mar 160,000 $350,000 Apr 130,000 $319,500 May 170,000 $362,500 Jun 200,000 $400,000 Assume that the relevant range includes all of the activity levels mentioned in this problem. What is Casablanca's dependent variable?