Lee is debating between two fruit baskets to send to his grandmother. The first basket includes an arrangement of pineapple slices and chocolate dip. The second basket includes a selection of apples and caramel dip. The cost of the apples is 3/5 the cost of the pineapple slices, as shown in the table. Three times the cost of the first basket is equal to four times the cost of the second basket. What is the cost of the pineapple slices?