What is the optimal value of the objective function?

at the optimum, what was the capacity utilization of machine 4?

what was the average shadow price going from demand of 3500 to demand of 4000?

how much product would be produced at optimum if the price of product was $19?

A product can be produced on four different machines. Each machine has a fixed setup cost, a variable production cost per unit, and a given production capacity as indicated below. A total of 2,500 units of the product needs to be produced. Setup cost Variable cost Capacity Machine 1 $ 700 $ 16 900 Machine 2 $ 800 $ 18 1,200 Machine 3 $ 920 $ 22 1,000 Machine 4 $ 1,040 $ 20 1,600