please correct the tax cost!

Firm Q is about to engage in a transaction with the following cash flows over a three-year period. Use Ap pendix A and Appendix B. Required: If the firm's marginal tax rate over the three-year period is 30 percent and its discount rate is 6 percent, compute the NPV the transaction. Note: Expenses and cash outflows should be indicated by a minus sign. Round discount factor(s) to 3 decimal places a final answer to the nearest whole dollar amount. Answer is complete but not entirely correct