The table below decribes the demand curve facing a monopolist. Use the information in the table to answer the following questions. Quantity Price 1 $20 2 $18 3 $16 4 $14 5 $12 6 $10 a.) What is the monopolist's total revenue from selling four units? [ Select ] [ Select $40 b.) What is the marginal revenue from selling the second unit? $44 $48 $56 c.) What is the marginal revenue from selling the third unit? [Sell $64 $76 $80