Hi, can you explain how to calculate this? Thank you

Question 12 0 / 1 point Consider a firm in a monopolistically competitive industry with a firm demand curve of P = 30 - 0.2Q, and a marginal revenue curve of MR = 30 - 0.4Q. If the monopolist has fixed costs of 400, and constant marginal costs of MC = 5, what is their profit or loss? (Round to a whole number, and report losses as a negative number.) Answer: 693.75