Please help me with the question. It's urgent.

The graph below shows the demand for Cosmic shampoo. D 140 120 100 80 Costs and revenues 60 40 20 0 200 400 600 800 1000 1200 1400 Quantity per periodSuppose there are no fixed costs and marginal cost is a constant $70. a. What are the perfectly competitive price and output? Price: $ 70 Output: 600 b. What are the cartel (monopoly) price and output? Price: $ 105 Output: 300 c. If there are only four firms in the cartel, what are the price and output of each firm, assuming equal shares? Round your answers to 1 decimal place. Price: $ 105 Output: 75