Below Is the Published All Units Discount Schedule for Cases

Essay

Below is the published all units discount schedule for cases of Brightall lightbulbs, with breakpoints at 100, 250, and 500. $$\begin{array} { c c } < 100 \text { cases } & \$ 5.00 / \mathrm { case } \\100 - 250 \text { cases } & \$ 4.50 / \mathrm { case } \\251 - 500 \text { cases } & \$ 4.00 / \mathrm { case } \\> 500 \text { cases } & \$ 3.80 / \mathrm { case }\end{array}$$ Obviously, no one would buy 99 cases at a cost of $495 since you can get 110 cases at the same price.What are the real breakpoints?