Figure 19-1 A graph of Q versus L shows a curved line, increasing from left to right from the origin and through the following points. (1, 120), (2, 210), (3, 285), (4, 345), (5, 390), and (6, 420). Refer to Figure 19-1. The marginal product of the second worker is a. 90 units of output. b. 210 units of output. c. 105 units of output. d. 330 units of output