Hi please help

The graph below shows the demand for Cosmic shampoo. E 140 120 100 80 Costs and revenues O 200 400 600 800 1000 1200 Quantity per period Suppose there are no fixed costs and marginal cost is a constant $70. a. What are the perfectly competitive price and output? Price: $ Output: b. What are the cartel (monopoly) price and output? Price: $ Output: c. lfthere are only four firms in the cartel, what are the price and output of each firm, assuming equal shares? Round your answers to'l decimal place. Price: $ Output