Six years ago, Nebrow Inc. purchased a polishing machine for $600,000. The company expected to use the machine for 10 years with no residual value at the end of the tenth year. The machine has been generating annual cash revenue of $460,000 and incurring annual cash operating costs of $210,000. Nebrow is considering the purchase of a new digital polishing machine for $800,000, which will have annual cash revenues of $690,000 and annual cash operating costs of $180,000. The new machine is expected to have a useful life of four years. The company uses the straight-line depreciation method with no salvage value to depreciate all its assets. Assume, for purposes of analysis, that Nebrow is subject to a 40% tax rate. What is the annual incremental after-tax cash flow (AATCF) for this replacement decision analysis