Exercise $12-1($Algo$)$ Payback Method $[$LO$12-1]$

The management of Unter Corporation, an architectural design firm, is considering an investment with the following cash flows:

Required:

Determine the payback period of the investment.

Would the payback period be affected if the cash inflow in the last year were several times as large?

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Determine the payback period of the investment. $($Round your answer to $1$ decimal place.$)$