Sales$ 105,000 Variable expenses73,500 Contribution margin31,500 Fixed expenses27,720 Net operating income$ 3,780 Required: 1. What is the contribution margin per unit

Which of the following statements is (are) true? i. free entry to a perfectly competitive industry results in the industry's firms earning zero economic profit in the long run, except for the most efficient producers, who may earn economic rent. ii. in a perfectly competitive market, long-run equilibrium is characterized by lmc < p < latc. iii. if a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.