What do I actually do on 1.5.3

Use the equation $C(x) = 2500 + 20x$ or the "Total cost (R)" row from the table.

• Mark the point $(0, 2500)$
• Mark the point $(50, 3500)$
• Mark the point $(100, 4500)$ (using the value of M you calculated)
• Mark the point $(200, 6500)$
• Mark the point $(300, 8500)$

Connect these five points with a straight line. Label this line "Total Cost".

Use the equation $I(x) = 48x$ or the "Total income (R)" row from the table.

• Mark the point $(0, 0)$
• Mark the point $(50, 2400)$
• Mark the point $(100, 4800)$
• Mark the point $(200, 9600)$ (using the value of N you calculated)
• Mark the point $(300, 14400)$

Connect these five points with a straight line. Label this line "Total Income".

The graph will show how the total cost and total income change with the number of dozens of scones sold. The point where these two lines intersect is the break-even point.