Text: As the discount increases above 4.5a, the postal service falls below breakeven and will have to make up the losses with a price increase for all mailers, both those who are now presorting and those who have not thus far been affected.
Entailment: The postal service's breakeven point lies above a discount rate of 4.5a.
Contradiction: The postal service can still make a profit at a discount rate of 6a.