Initial Investment: $$500,000$

Project Duration: $6$ years

Discount Rate: $10\%$

Improved Annual Net Cash Inflows:

$\backslash$table$[[$Year$,$Net Cash Inflow$],[1,$$$90,000],[2,$$$100,000],[3,$$$110,000],[4,$$$120,000],[5,$$$135,000],[6,$$$140,000]]$

Revised Payback Period Calculation

$\backslash$table$[[$Year$,$Cash Inflow,Cumulative Cash Flow$],[1,$$$90,000,$$$90,000],[2,$$$100,000,$$$190,000],[3,$$$110,000,$$$300,000],[4,$$$120,000,$$$420,000],[5,$$$135,000,$$$555,000]]$

Payback Period $=4(80,000135,000)$~~$4\mathrm{.}59$ years

$$ Investment is recovered in under $5$ years

Are these calculations accurate