Tuener Hardware is adding a new product ine that wil requite an investrent of $1,418,000. Maragers estimate that this invesiment wil have a 10 -year ile and generate net cash infows of $315,000 the first year, $290,000 the second year, and $230,000 each year thereafter for eight yeurs. The invesiment has no residual value. Compule the payback penod. First enler the formula, then caiculabe the payback period. (Round your ansaer to faro decimal places.)