$(Table$: Variable Costs for Pool Cleaning$)$ Use Table: Variable Costs for Pool Cleaning. During the summer, Elijah runs a pool cleaning service, and pool cleaning $is$ a perfectly competitive industry. Assume

that costs are constant $in$ each interval; $so,$ for example, the marginal cost $of$ cleaning each pool from $1$ through $10is$ $$10.$ Also assume that $he$ can only clean the quantities $of$ pools given $in$ the table $(and$

not numbers $in$ between$).$ His only fixed cost $is$ $$1,000$ for the pool cleaning equipment. His variable costs include fuel, his time, and other everyday pool supplies. Which point falls $on$ Elijah's short$-$run

supply curve?

$a.P=$$$20,Q=300$

$b.P=$$$60,Q=40$

$c.P=$$$10,Q=100$

$d.P=$$$5,Q=10$