A. Fred Stickwick produces fixed proportion goods A and B, with QA = QB, marginal costs MC, and marginal revenues MRA and MR. If demand for A is greater than demand for B, Fred should only: O produce B to the quantity where MRB = 0. sell B to the quantity where MRB = 0 if MRA is still > MC. O produce B to the quantity where MRB = MC. O sell B to the quantity where MRB = MC. O produce B to the quantity where MRB = MRA- B. A monopolist faces the demand curve q = 90 - p/2, where q is the number of units sold and p is the price in dollars. She has quasi-fixed costs, C, and constant marginal costs of $20 per unit of output. Therefore her total costs are C + 20q, if q > 0, and 0, if q = 0. What is the largest value of C for which she would be willing to produce positive output? $20 $2,560 O $3,200 O $4,800 O $3,840