the accompanying graph depicts average total cost (atc), marginal cost (mc), marginal revenue (m), and demand (d) facing a monopolistically competitive firm. place point a at the firm's profit maximizing price and quantity. what is the firm's total cost? price and cost ($) quantity 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 50 mr d mc atc a total cost: $ what is the firm's total revenue? total revenue: $ what is the firm's total profit?