The initial outlay or cost is $$1,600,000$ for a four$-$year project. The respective future cash inflows for years $1,2,3$ and $4$ are: $$400,000,$$$500,000,$$$600,000$ and $$200,000.$ What is the payback period without discounting cash flows?

About $3\mathrm{.}00$ years

About $3\mathrm{.}50$ years

About $3\mathrm{.}25$ years

About $2\mathrm{.}67$ years

About $2\mathrm{.}50$ years