Suppose that an academician wants to subscribe to some scientific journals. The various journals under consideration, the subscription price in $ and the readership of the journals are given in the table below. Annual readership 7840 6175 8510 7375 7875 Journal 2 345 5 Annual subscription 80 95 115 125 105 The available budget of the academician for annual subscription to these journals is $450. Find the optimal set of journals that must be selected that has the maximum total readership.