1) 100 & lt； = x<= 200, y = 20-0.8 * (x-100)/10 = 28-0.08x When x = 200, y = 28-0.08 * 200 = 28-/kloc-. =300，y = 12- 1 *(x-200)/ 10 = 32-0. 1x 2)w = xy-40y-480- 1520 = xy-40y-2000 =(x-40)y-2000 100 & lt； = x<= 200, w = (x-40) (28-0.08x)-2000 =-0.08x2+31.2x-3120 parabola with downward opening and axis of symmetry x = 31.2. 0 200<x<= 300, w = (x-40) (32-0.1x)-2000 =-0.1x 2+36x-3280 parabola opens downwards, and the symmetry axis x = 36/0.2 =/. 0 to sum up, w < 0, the company lost money in the first year of investment, with a minimum loss of 790,000 yuan. 3) Profit for the second year 100

Please accept it, thank you!