Problem $19-16($Static$-$updated$)$

A garden store prepares various grades of pine bark for mulch: nuggets $(x_1),$ mini$-$nuggets $(x_2),$ and chips $(x_3).$ The process requires pine bark, machine time, labor time, and storage space. The following model has been developed.

$\backslash$table$[[$Maximize$,9x_1+9x_2+6x_3($profit$)],[$Subject to$,],[$Bark$,5x_1+6x_2+3x_{3}600$ pounds$],[$Machine$,2x_1+4x_2+5x_{3}600$ minutes$],[$Labor$,2x_1+4x_2+3x_{3}480$ hours$],[$Storage$,)]]$

a$-1.$ What is the shadow price of a pound of pine bark? $($Round your answer to $2$ decimal places.$)$