Please answer the following questions

Suppose Cournot duopolist firms operate with each having a cost of 30q; (i = 1,2) so that each firm's marginal cost is 30. The inverse market demand curve is P = 120 - Q where Q = q1 + q2. At the Nash-Cournot equilibrium, the total quantity, Q, is 45. 30. 60. 90.A monopolist faces the inverse demand curve P = 60 - Q. It has variable costs of Q2 so that its marginal costs are 2Q, and it has xed costs of 30. If a governmental agency imposes an $8 per unit specic tax on output, the deadweight loss from both the monopoly and the tax is