The graph shows the demand curve facing Ji|| the monopolist who cannot sell partial units. 168 154 140 126 112 In (I) 98 E a.) 84 3 D: 70 56 42 28 14 0 0 2 4 6 8 10 12 Quantity per period - m a) Using the above graph, fill in columns 2, 3, and 4 in table below. (1) (2) (3) (4) (5) (6) (7) Quantity AR1 MR1 TR1 AR2 MR2 TR2 1 2 3 4 8 10 11 12