The Company is considering the purchase of a new landfill. the purchase price and prepatory work cost $$322,080\mathrm{.}00.$ The land would be useable for $10$ years. Company hired a consultant who estimated that the new landfill will cost less to operate $($savings$)$ of $$48,000$ per year than tgthe current landfill. The currenENT landfill will also last $10$ more years. based on these problem. $3$que questions asked. a$.$ What is the payback period for this investment?

b$.$ Calculate the net present value of the new landfill.

c$.$ Calculate the internal rate of return for the land fill?