Winston uses the high-low method. It had an average cost per unit of $5.30 at its lowest level of activity when sales equaled 10,000 units and an average cost per unit of $3.70 at its highest level of activity when sales equaled 20,000 units. What would Winston estimate its total cost to be if sales equaled 9,000 units? Multiple Choice S50, 900 S32,000 518 900