please help me solve this task

4) Your factory owns an old machine which has four more years of life remaining. Its current book value is $14 million and straight line depreciation can be used to compute any tax breaks. The tax rate is 20% and the discount rate is 11% per year. You receive revenues of $11 million per year from this machine's production, and it costs you $3 million per year to employ this machine's operators. Assume that all cash flows are end of year, so that you must discount the first cash flow. Another factory has offered to buy this machine from you for $23 million, would you agree? Show your work