$\"\"$

The product(in dollars) equation is $\"\"$ .

Estimate the sales level when selling price is $\"\"$ by using graph.

Graph the functions $\"\"$ and $\"\"$ .

Graph:

$\"\"$

Observe the graph:

The intersecting point is $\"\"$ .

The sales level when selling price $\"\"$ is $\"\"$ .

$\"\"$

Find the consumer surplus for the fallowing demand curve at the sales level $\"\"$ .

$\"\"$ and $\"\"$ .

$\"\"$

Observe the graph:

$\"\"$ .

$\"\"$

The sales level when selling price $\"\"$ is $\"\"$ .

Consumer surplus for this sales level is $\"\"$ .