4) The Indian Oil Company has two depots, A and B with capacities of 3000 litres and 2000 litres, respectively. The company is to supply oil to three petrol pumps C.D and E whose demands are 1500 litres, 2000 litres and 1500 litres, respectively, The distance (in km) between the depots and the petrol pumps are given in the following tables: PETROL PUMPS D E Depot A: 4 2 3 Depot B: 2 6 4 Assuming that the transportation cost per km. is Re 1 per litre, how should the delivery be scheduled in order that the transportation cost is minimum, Formulate the above transportation problem mathematically and then solve graphically linear programming approach