Stanton Stax wants to add a new assembly line. This addition will expand capacity, resulting in the firm receiving incremental cash flows of $35,000 per year for the next four years. At the end of the fourth year. Stanton will sell the equipment for this line for $10,000. The purchase price of the equipment is $100,000. At what cost of capital (required return) is Stanton indifferent between investing and not investing in the new assembly line? At what cost of capital should Stanton make the investment