Edward's Pottery is looking into purchasing a simple robot to help form clay to turn into vases. They believe that such a machine would greatly improve productivity. Last month, Edward's spent $$300$ on materials, $$400$ on labor and their energy costs were $$150$ in that month they produced $1,500$ vases. With the robot, they expect the following costs: materials$--$$$250,$ labor$-$$$150,$ energy$-$$$150,$ and capital$-$$$450.$

What was the productivity of the older system?

$2\mathrm{.}50$vase$\frac{s}{\text{\$}}$

$0\mathrm{.}75$ vases$/$$

$1\mathrm{.}50$ vases $\frac{?}{?}$$

$1\mathrm{.}76$ vases$/$$