Silverado Mining Company 15 analyzng the purchase of two silver mines Only one investrnent will be made The Yukon mune wil cost $2100,000 mulich, which will produce $420,000 per year in Years 5 through 15 and $840,000 per year in Years 16 through 25 The a-1. Calculate the net present value for each project (Do not round intermediate calculations. Round the final answers to the nearest whole dollar. Enter your answers in whole dollars, not in millions.) a-2. Which investment shoufd be medo, if projects are mutually exciusive? Yikon Labrodor b-1. If the Yukon mine jusufies an extra 5 percent premium over the normal cost of capital because of its riskiness and relative: uncertanty of flows, recalculate the net present value of the mine. (Negative answer should be indicated by a minus sign. Do not round intermediate calculations. Round the final answers to the nearest whole dollar. Enter your answers in whole dollars, not in millions: b-2. Does the investment-decision change