The revenue​ R(x), cost​ C(x) and profit​ P(x) for a product are graphed in the figure to the​ right, where x is the quantity produced and sold. ​a) Determine the​ break-even quantity, ​b) Find the equations of the three functions. ​c) Determine the fixed​ cost, the cost to produce each​ item, the selling price of each​ item, and the net profit per item. 20 40 -40 240 x y P R C A coordinate system has a horizontal x-axis labeled from 0 to 40 in increments of 10 and a vertical y-axis labeled from negative 40 to 240 in increments of 40. A line labeled P rises from left to right from the plotted point (0, negative 40) to the plotted point (40, 40). A line labeled R rises from left to right from the plotted point (0, 0) to the plotted point (40, 240). A line labeled C rises from left to right from the plotted point (0, 40) to the plotted point (40, 200). Lines R and C intersect at approximately (20, 120). Question content area bottom Part 1 ​a) The​ break-even quantity is    20 items sold. Part 2 ​b)​ P(x)equals    2 x minus 40 ​(Type an expression using x as the​ variable.)     ​R(x)equals    6 x ​(Type an expression using x as the​ variable.)     ​C(x)equals    4 x plus 40 ​(Type an expression using x as the​ variable.) Part 3 ​c) The fixed cost is ​$    240. The cost to produce each item is ​$    120. The selling price of each item is ​$    120. The net profit per item is ​$    0.