The Railway Association is considering the purchase of sensors to connect to various mapping technologies. The sensors, which could be purchased for $300 each, can be expected to have a useful life of seven years, with no salvage value. If the Railway Association management wishes to earn an annual after tax, time adjusted rate of return of at least 6% on its funds, compute the minimum after-tax cash flow that each sensor would have to generate to attain this rate of return. (For 6%, 7 years, the present value factor is 5.582).