The graph shows the demand, marginal revenue, and cost schedules for barrels of springwater sold by James. A graph plots a demand curve and an MR curve with Quantity along the horizontal axis and Price, costs, marginal revenue along the vertical axis. The demand curve and the MR curve start at 16 on Price and have negative slopes. A point is marked on the demand curve at 4 on quantity, 12 on Price. A horizontal line, labeled MC equals AC, starts at 8 on price and runs parallel to quantity. The line intersects the MR curve at 4 on quantity and the demand curve at 8 on quantity. If James's firm is a monopoly, consumer surplus is $_____