Question 4: (10 marks) (B1, C3) Zain must decide how best to use a monthly factory capacity of 1,500 units. Demand from regular customers is risky and could be either 500, 600 or 700 units per month. Regular customers generate contribution of $6 per unit. Zain has the opportunity to enter a special contract which will generate contribution of only $4 per unit. For the special contract, she must enter a binding agreement now at a level of 1000, 800 or 600 units. Instructions: Display all possible contributions in the table below. Show your calculation. Special contract 1000 800 600 Demand units 500 600 700