◆ Stage2 The conclusion is that the optimal solution, the value of X and Y that maximises the profit function, must lie at one of the corner points Profit 0 0 0 Read off graph 0 40 120 Read off graph 10 130 Solving, see i) below. 0 110 Solving, see ii) below 22.5 0 90 Read off graph Stage 2 – The conclusion is that the optimal solution, the value of X and Y that maximises the profit function, must lie at one of the corner points. X Y Profit 0 0 0 Read off graph 0 40 120 Read off graph 10 30 130 Solving, see i) below. 20 10 110 Solving, see ii) below. 22.5 0 90 Read off graph