During 2020 Gravel Corporation had variable cost per unit of $1,000, fixed cost per unit of $800, and net income per unit of $200. The company produced and sold 2,000 units. Which of the following is the equation for the line representing the cost function? y = 800x + 1,000 Oy-200x + 800 O y = 200x + 1,800 o y = 1,000x + 1,600,000 O y = 1,800 x + 1,600