The blue line on the following graph shows a firm's daily costs for the first 90 days of the fiscal year. Because the firm is expanding, its costs are constantly rising. C?) 'lO EXPENSES (Thousands of dollars per day) 20 :30 40 50 60 70 80 90 100 TIME (Days) The area of the shaded quadrilateral is V . The area of the quadrilateral corresponds to the Y between