please explain!

Dakmont Company has an opportunity to manufacture and sell a new product for a four-year period. The company's discount rate is 77\%. After careful study, Oakmont estimated the following costs and revenues for the new product: When the project concludes in four years the working capital will be released for investment elsewhere within the company. Click here to view Exhibit 148-1 and Exhibit 148-2, to determine the appropriate discount foctor(s) using tables. Nequired: Calculate the net present value of this investment opportunity. (Round your final answer to the nearest whole dollar amount.)