Payback period. A project is expected to generate the after$-$tax cash flows shown below. The company's weighted average cost of capital is $10\mathrm{.}5\%$ per year. What is the project's payback period?

$\backslash$table$[[$Year$,0,1,2,3,4],[$sh flows,$-$$$1,100,$$$400,$$$400,$$$400,$$$400$