Short description:A graph plots output against price in dollars.Long description:The horizontal axis representing quantity ranges from 0 to 12, in increments of 1. The vertical axis representing price in dollars ranges from 0 to 10, in increments of 1. The graph shows a line that passes through the following points: (5, 8), (6, 7), (7, 6), (8, 5), (9, 4), (10, 3), (11, 2), and (12, 1). Horizontal and vertical lines are extended from the points, (5, 8), (6, 7), (9, 4), and (10, 3) to meet the axes. The region within the consecutive lines is shaded. Note: The values are approximate. Refer to the figure above. What is the change in total revenue for this firm as it increases output from 9 units to 10 units? Question 15 options: $6 $2 $0 -$2 -$6