The Abco Company manufactures electrical assemblies. The current process uses $10$ workers and workers are paid at a rate of $$20$ per hour. Suppose the material cost is $$300$ per hour, and overhead is charged at $150\%($or $1\mathrm{.}5$ times$)$ labor costs. What is the input per hour?

$800$

$900$

$700$

$600$