The directors of The Cheddar Cheese Company Ltd have a choice of three cheese packing machines, each of which would cost £150,000 and have an estimated useful economic life of 5 years, with no residual value. Estimate the annual profits for each machine by deducting the annual depreciation charge from the annual cash flows, using the straight-line method. Then calculate the ARR for the three machines and consider this information with the payback periods you calculated in section 18.4.