Refer to the following table:

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|$c$|$c$|\}$

$\backslash$hline Level of Activity & $\backslash$begin$\{$tabular$\}\{$l$\}$

Total $\backslash \backslash$

Benefit

$\backslash$end$\{$tabular$\}$ & $\backslash$begin$\{$tabular$\}\{$l$\}$

Total $\backslash \backslash$

Cost

$\backslash$end$\{$tabular$\}$ & Marginal Benefit & Marginal Cost & $\backslash$begin$\{$tabular$\}\{$l$\}$

Net $\backslash \backslash$

Benefit

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

$\backslash$hline $0$ & & $0$ & xx & xx & $0\backslash \backslash$

$\backslash$hline $1$ & $200$ & $30$ & & & $\backslash \backslash$

$\backslash$hline $2$ & & & $100$ & & $230\backslash \backslash$

$\backslash$hline $3$ & & & & $50$ & $270\backslash \backslash$

$\backslash$hline $4$ & $450$ & & & $65$ & $\backslash \backslash$

$\backslash$hline $5$ & & $255$ & $30$ & & $\backslash \backslash$

$\backslash$hline $6$ & $500$ & & & $75$ & $\backslash \backslash$

$\backslash$hline

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

What is the net benefit of the $\backslash (5^\{\backslash$text $\{$th $\}\}\backslash )$ unit of the activity?