$7\mathrm{.}26$ Identify the net cash flows shown below as either conventional or nonconventional.

$\backslash$begin$\{$tabular$\}\{$lrrrrrr$\}$

Year & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{0\}\backslash )\}$ & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{1\}\backslash )\}$ & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{2\}\backslash )\}$ & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{3\}\backslash )\}$ & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{4\}\backslash )\}$ & $\backslash$multicolumn$\{1\}\{$c$\}\{\backslash (\backslash$mathbf$\{5\}\backslash )\}\backslash \backslash$

$\backslash$hline$\backslash (($a$)\backslash )$ & $400$ & $300$ & $200$ & $100$ & $0$ & $-100\backslash \backslash$

$\backslash (($b$)\backslash )$ & $-50$ & $-50$ & $-50$ & $40$ & $40$ & $40\backslash \backslash$

$\backslash (($c$)\backslash )$ & $-1000$ & $200$ & $300$ & $400$ & $300$ & $200\backslash \backslash$

$\backslash (($d$)\backslash )$ & $-6000$ & $-500$ & $-500$ & $-750$ & $10,000$ & $-2000\backslash \backslash$

$\backslash (($e$)\backslash )$ & $50$ & $-10$ & $50$ & $50$ & $50$ & $50\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$