4. An arena has 49,000 seats. Seats sell for $25 on the ground level, $20 in mid-level, and $15 in upper level. The number of seats on the ground level is equal to the total number of seats in the mid-level and upper level combined. Suppose the arena brings in $1,052,000 from a sold-out event. How many seats does each level hold? A) Define the variables: B) Create the 3 equations: Let Let Let