A certain concert venue has a total of 500 seats, some of which are premium seats near the stage, with the rest of the seats being standard seats further away from the stage. Premium seats at this venue cost $30, while standard seats at this venue cost $21.
At the last concert, a total of $11,616 were collected in seat revenue.
Assuming all 500 seats were filled, how many of each type of seat was purchased?

1) Determine the number of Standard Seats.

2) Determine the number of Premium Seats.