Problem $2-18($Algo$)$

A retail store had sales of $$45,100$ in April and $$55,200$ in May. The store employs eight full$-$time workers who work a $40-$hour week. In April, the store also had seven part$-$time workers at $13$ hours per week, and in May the store had eight part$-$timers at $17$ hours per week $($assume four weeks in each month$).$

Using sales dollars as the measure of output, what is the percentage change in productivity from April to May?

Note: Round your intermediate calculations and final answer to $2$ decimal places.

Change in productivity