Q$\mathrm{.}8$ The standard labour and actual labour engaged in a week for a job are as under:

$\backslash$table$[[,$Skilled,Semi$-$skilled,Unskilled$],[$Standard No$.$ of workers,$32,12,6]]$

$16$

$\backslash$table$[[$Standard hourly Rate $($Rs$.),3,2,1],[$Actual No$.$ of workers,$28,18,4],[$Actual Hourly Rate $($Rs$.),4,3,2]]$

During the $40$ hour working week, the gang produced $1,800$ standard labour hours of work. Compute variances.