A factory employs $50$ workers, each paid a basic hourly rate of R$55\mathrm{.}00$ for a $35-$hour working week. Overtime is paid at R$75\mathrm{.}00$ per hour. It takes each employee $3$ hours to produce one unit of the sole product. On average, employees work $4$ hours of overtime per week.

Management is considering automating part of the production process, which will reduce the unit production time by $30$ minutes. It is expected that with the new system, overtime will no longer be required.

REQUIRED:

What would be the effect of the new system on the labour cost per unit?

A$.$ R$23\mathrm{.}07$ increase

B$.$ R$33\mathrm{.}65$ decrease

C$.$ R$23\mathrm{.}07$ decrease

D$.$ R$33\mathrm{.}65$ increase