Explain clearly

Economic profits in the rent-a-centere $400,000 per firm. Assuming that the industry is perfectly competitive, the industry is in equilibrium. O firms will leave the industry and supply will fall. O new firms will enter and the supply of the car rentals will increase. O new firms will enter but there will be no effect on the supply of car rentals.A firm can sell 7 units at $15, but to sell 8 units, the firm must cut the price to $14. The marginal revenue derived from selling the 8th unit is O -$8. O $8. O O. O $3. O $7