Answer:
$800
Step-by-step explanation:
Price discrimination is a technique used by business owners and business in general that consists on chargin a certain group the maximum they are willing to pay for the product of service, in this case it would be $12 for adults and $8 for students, to know how much they will make we just multiply the cost of the tickets by the tickets bought, and the fmor that withdraw the cost of operation.

Now we know the museum made $2800 in tickets, we take out the $2000 of the operational cost, and we are left with $800 wich would be the net profit for the museum.