An outdoor furniture company makes furniture out of recycled plastic. Their current production strategy calls for four $10-$hour days of production each week. One step in the process currently use $4$ extruders which each process at a rate of about $150$ pounds of plastic per hour. This step also requires $2$ operators who handle loading, clearing, and cleaning the machines. The company is considering buying an additional extruder that would work at the same rate $(150lb\frac{s}{?}$ hour$)$ as the existing extruders. The company expects the new extruder to be accommodated with no changes to the labor team. What is the gain in labor productivity in pounds of plastic per labor$-$hour?