purchased inventory management computer software at a cost of $1\mathrm{.}771\mathrm{.}950$ Cost from the investment over the next six years will produce the following cash flow stream : $,253,240,322\mathrm{.}600544,250782,320$ and N$04\mathrm{.}740,$ What is the payback period on this investment? Round to $2$ decimal places $15\mathrm{.}25)$