Monopoly profit maximization and taxes

The inverse demand curve is p = 120 - Q and the marginal cost is constant at 10.

a. Assume that this is a monopolistic market. What is the deadweight loss in this market as compared to an identical market with perfect competition?

b. Who bears the welfare losses from a monopoly in this case?

c. How does charging the monopoly a per-unit tax of t = 10 per unit affect the monopoly optimum and the welfare of consumers, the monopoly, and society (where society's welfare includes the tax revenue)?