Suppose that total costs $($TC$)$ double for each project listed in the table below.

Cost$-$Benefit Analysis for a National Highway Construction Project $($in Billions$)$

$\backslash$table$[[(1)$ Plan,$\backslash$table$[[(2)$ Total Cost of$],[$Project$]],\backslash$table$[[(3)$ Marginal$],[$Cost$]],\backslash$table$[[(4)$ Total$],[$Benefit$]],\backslash$table$[[(5)$ Marginal$],[$Benefit$]],(6)$ Net Benefit$],[$No new construction,$$0,-,$$$0,-,$$$0$