A company is considering purchasing factory equipment that costs $320,000 and is estimated to have no salvage value at the end of its 8-year useful life. If the equipment is purchased, annual revenues are expected to be $90,000 and annual operating expenses exclusive of depreciation expense are expected to be $38,000. The straight-line method of depreciation would be used.If the equipment is purchased, what is the annual rate of return expected on this equipment ?