Question $1$

A third$-$party logistics $(3$PL$)$ service provider receives an average of $2,200$ orders per day.

The warehouse engages $12$ workers to pick the orders. Each picker works $8$ hours to pick these orders per day. After undergoing an on$-$the$-$job training programme, the warehouse reported that only $4\%$ of orders have to be returned and re$-$picked again before dispatching. The return rate before the training was implemented was $8\%.$

This company takes great effort in setting and adhering to its warehouse KPI of In$-$Full delivery rate at $97\%.$

Question $1$a

Calculate the average orders picked per hour before and after workers have been trained. The return and re$-$pick orders will be counted as new orders. Each returned order requires an additional $0\mathrm{.}2$ hours to re$-$pick. What is the percentage increase in average orders picked per hour for this warehouse?