Windhoek Mines, Ltd$.,$ of Namibia, is contemplating the purchase of equipment to exploit a mineral deposit on land to which the company has mineral rights. The company estimated the following cash flows related to opening and operating a mine in the area:Cost of new equipment and timbersWorking capital required $....$Annual net cash receiptsCost to construct new roads in three years Salvage value of equipment in four years$*$Receipts from sales of ore, less out$-$of$-$pocket costs for salaries, utilities, insurance, and so forth.The mineral deposit would be exhausted after four years of mining, Al that point, the worr ang afa vuld be sit would beixvestment elsewhere. The company's required rate of return is $20\%.$