give me the answer and calculation process

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 $6,735 $5,388 6,735 10,776 10,776 10,776 10,776 10,776 10,776 13,470 13,470 13,470 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 9,698 8,100 10,800 13,500 16,200 18,900 21,600 39,467 47,145 59,268 Determine the relevant range of activity for this product. The relevant range of activity for this product units