Need help with NPV question.

would require that inventories be increased by $2,500, but accounts payable would simultaneously increase by $800. Dauten's marginal federal-plus-state tax rate is 25%, and its WACC is 11%. What is the NPV of the incremental cash flow stream? Negative value, if any, should be indicated by a minus sign. Round your answer to the nearest cent. $5 Should the company replace the old machine