Exercise 18-2 Shingle Enterprises is considering manufacturing a new product. It projects the cost of direct materials and rent for a range of output as shown below. Output Rent Direct in Units Expense Materials 1,000$ 5,060 4,048 2,000 3,000 4,000 5,000 6,000 7,000 8,0008,096 22,400 9,00010,120 29,652 10,000 10,120 35,420 11,000 10,120 44,528 5,060 7,286 8,096 8,400 8,096 11,200 8,096 14,000 8,09616,800 8,096 19,600 Determine the relevant range of activity for this product. The relevant range of activity for this product : units