A firms in a purely competitive industry is currently producing 1000 units per day at a total cost of $450. If the firm produced 800 units per day, it cost would be $300, and if it produced 500 per day, its total cost would be $275. What is the firm's ATC per unit at these levels of production based on the following if even firm had the same cost, the information that can be determined by each firms cost structure, highest possible price and what would be the market price if the normal rate is 10 percent?