Compute the multi factor productivity measure for each of the weeks of production of chocolate bars. Which week has the least productivity? Assume $40-$hour weeks and an hourly wage of $$12.$ Overhead is $1\mathrm{.}5$ times weekly labor cost. Material cost is $$6$ per pound.

$\backslash$table$[[$Week$,$Output $($units$),$Workers,Materials $($lbs$)],[1,25000,7,460],[2,30000,6,480],[3,33000,6,490],[4,36000,9,480]]$