Johnny's Carpet cleaning service had revenues that averaged $$70,000$ per week in April and $$53,000$ per week in May. During both months, the company $-$ employed $6$ full$-$time $(40$ hours$/$week$)$ workers. In April the firm also had $4$ part$-$time workers working $25$ hours per week but in May there were only $3$ part$-$time workers and they only worked $10$ hours per week. What is the percentage change in labor productivity from April to May for Johnny's Carpet cleaning service?$4\mathrm{.}90\%-15\mathrm{.}84\%$There was no change in productivity$+7\mathrm{.}94\%-4\mathrm{.}66\%$