Newton Rock Co is considering the purchase of a new rock crusher. This new machine will allow Newton to receive new cash flows of $8,000 per year for the next four years. At the end of the fourth year, Newton will sell the crusher for $25,000. The purchase price of the new rock crusher is $50,000. At what cost of capital (required return) is Newton indifferent between purchasing the crusher and not purchasing the crusher? 5.40% 4.50% 4.75% 3.67% 4.27%