... on the accounting books of the firm Book costs are not represented as beforetax cash flows Engineering economic analyses can involve both cash and book costs Cash costs are the before-tax cash... 25,000 choose A 25,000 < x < 80,000 choose B 80,000 < x < 100,000 choose C (b) See graph below for Solution: X 50 100 150 A 100 1,125 2,150 3,175 B 350 875 1,400 1,925 C 600 1,000 1,400 1,800 A B... $10,875 = This polynomial of degree can be solved using the quadratic formula: There will be two solutions: x = (-b + (b2 – 4ac)1/2)/2a = (-$230 + $205)/-0.50 Thus x = 870 and x = 50 There are