20,000 concert tickets were sold to the rihanna concert. stage level seats cost $105 and higher level seats cost $75. if the total money collected from selling tickets was $1.74 million, how many tickets of each type were sold?

12,000 higher level 
8,000 stage level

Let x = higher level seats and y = stage level seats. Then you can set up the system of equations for total costs as:

75x + 105y = 1,740,000

And the equation for total tickets sold as 

x + y = 20,000

Then solve using any method. 

Ibelieve it would be letter c (: