in the inverse market demand curve for a product is p=120-2Qd, where p is the price in dollars per unit and Qd is the quantity demanded, and a profit-maximizing monopolist's marginal cost curve for the product is MC=30+Qs, where Qs is the quantity supplied, then in equilitrium:

the price is 60, quantity is 30, deadweight loss is 0

price 60,quantity 18, deadweight loss 72

price84, quantity 18, deadweight loss 144

price 84, quantity 18, deadweight loss 216