Hiii im stuck :)

With a demand curve of

Q= 80-4/3P

and average total cost of production of

ATC= 0.5Q+10+ (1,000)/Q

Which is not true?

• max total profit is positive
• max value of total revenue function is 1200
• profit maximizing price is P = 45
• the total cost of production is TC = 0.5Q^2+10Q+1,000

Thanks <3