BA firm believes a product's sales volume (S) depends on its unit selling price (P) as S = $100 – P. The production cost (C) is $1000 + 10S. (a)

Graph the sales volume (S) from 0 to 100 on th ex axis, total cost and total income from $0 to$2500 on the y axis, C= $1000 + 10S, and plot the curve of total income. Mark the break even points on the graph. (b) Determine the breakeven point (lowest sales volume at which total sales income just equals total production cost). (c) Determine the sales volume (S) at which the firm's profit is a maximum.