Answer: Consumer Surplus is defined as difference between the price consumers are willing to pay for a good less the price they actually pay for it. When the equilibrium price is $50, the maximum willingness to pay $100 and the quantity is 500. It is given by,
[tex] CS=\frac{1}{2}* (Willingness to pay - Equilibrium Price) * Quantity [/tex]
[tex] = \frac{1}{2} * ($100 - $50) * 500
[/tex]
[tex] =\frac{1}{2} * $50 * 500 [/tex]
[tex] = $12,500 [/tex]