The weekly output of a production process is shown below, together with data for labour and material inputs. The standard inventory value of the output is R$650$ per unit. Overhead is charged weekly at the rate of is given in the table plus $2\mathrm{.}5$ times direct labour cost except for week $1$ and $3,$ which is $3$ time material cost. The production line runs $6$ days a week $8$ hour a and an hourly wage of R$200.$ Material cost is $R100$ per running meter.

$\backslash$table$[[$material$,$worker,output,Overhead,$],[4000,10,2500,1500,$Week $1],[3000,15,5000,1000,$Week $2],[5200,10,3000,1900,$Week $3],[5500,15,2000,1200,$Week $4],[6000,25,4000,1300,$Week $5]]$

Calculated

The average multi$-$factor productivity for this process

Which week is the most productive

$20$

$2$

What is the problem with week $3$

$[3]$