Charles Lackey can also improve the yield by purchasing a new blender. The new blender will mean an increase in his investment. This new blender will mean an increase in his costs of $$$$100$ per$$ month, but he will achieve the same new output$($an increase to $1,875\mathrm{.}00)$ as the change in labor hours. Part $2$a$)$ Current productivity for $640$ work hours