Which cost option has the lowest variable cost?

If you only require 25 units of product, which cost option should you choose?

Which cost option has the lowest fixed cost?

The graph shows 3 different cost options a company has to acquire a product from the supplier. The x-axis shows number of units of product and the y-axis shows the 3 linear cost functions; in red, blue and green. -400 300 200 (0,160) 100 (50, 350) (70,370) 0 20 40 60 80