9. Four factories are engaged in the production of four types of toys. The following table lists the toys that can be produced by each factory. All toys require approximately the same per-unit labor and material. The daily capacities of the four factories are 250, 180, 300 and 200 toys respectively. The daily demands for the four toys are 200,150,350 and 100 units respectively. Determine the network representation of the problem. Table 5: Product mixes