$D(x)=900-10x$ is the price, in dollars per unit, that consumers are willing to pay for $x$ units of an item, and $S(x)=250+15x$ is the price, in dollars per unit, that producers are willing to accept for $x$ units of an item. Find:

The equilibrium quantity:

The equilibrium price:

The consumer surplus at the equilibrium point

The producer surplus at the equilibrium point: