Compute the payback period for an investment with the following net cash flows. $($Round your answer to one decimal place.$)$ YearNet Cash Flows per YearCumulative Net Cash FlowsInitial investment$ $(100,000)$$ $(100,000)1\mathrm{.}10,000(90,000)2\mathrm{.}20,000(70,000)3\mathrm{.}20,000(50,000)4\mathrm{.}30,000(20,000)5\mathrm{.}40,00020,0006\mathrm{.}40,00060,000$