PLEASE HELP URGENT!!!

A company is considering purchasing a machine that costs $312000 and is estimated to have no salvage value at the end of its 8 -year useful life. If the machine is purchased, annual revenues are expected to be $120000 and annual operating expenses exclusive of depreciation expense are expected to be $38000. The straight-line method of depreciation would be used. If the machine is purchased, the annual rate of return expected on this machine is 13.78% 52.56% 27.56% 26.28%