A fruit juice company makes two special drinks by blending apple and pineapple juices. The first drink uses 30% apple juice and 70% pineapple, while the second drink uses 60% apple and 40% pineapple. There are 1000 liters of apple and 1500 liters of pineapple juice available. The profit for the first drink is $0.60 per liter and that for the second drink is $0.50. Use the simplex method to find the number of liters of each drink that should be produced in order to maximize the profit.​