$\backslash$table$[[,\backslash$table$[[$Number of$],[$Fans$]],\backslash$table$[[$Number of$],[$Cooling Coils$]],\backslash$table$[[$Manufacturing$],[$Time $($hours$)]]],[$Economy$,1,1,8],[$Standard$,1,2,12],[$Deluxe$,1,4,14]]$

model for the problem is as follows:

$]2,600[0$

The computer solution is shown below.

$\backslash$table$[[$Variable$,$Value,Reduced Cost$],[$E$,120\mathrm{.}00000,0\mathrm{.}00000],[$S$,120\mathrm{.}00000,0\mathrm{.}00000],[$D$,0\mathrm{.}00000,-24\mathrm{.}00000$