Demand curve is .

Supply curve is .

Substitute in .

Consumer surplus of the commodity : .

Substitute corresponding values in consumer surplus of the commodity.

The consumer surplus is .

Producer surplus of the commodity : .

Substitute corresponding values in consumer surplus of the commodity.

The producer surplus is .

Graph :

Draw a coordinate plane.

Graph the functions and .

From the graph consumer surplus is .

From the graph producer surplus is .

The consumer surplus is .

The producer surplus is .

From the graph consumer surplus is .

From the graph producer surplus is .