Payback Period with account of the cash discount:

$\begin{array}{l}\displaystyle DPP = A + B/C\end{array}$

where

$\begin{array}{l}A\end{array}$	Last period with a negative discounted cumulative cash flow
$\begin{array}{l}B\end{array}$	Absolute value of discounted cumulative cash flow at the end of the period A
$\begin{array}{l}C\end{array}$	Discounted cash flow during the period after A

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See also