Respuesta :

Total Seat sold = 1200 - 30 = 1170

Assumed all tickets were regular seats:
1170 x 20 = $23 400

Difference in amount collected:
$36 100 - $23 400 = $12 700

Difference in ticket price:
 $40 - $20 = $20

Number of premium seats sold:
$12 700 ÷ 20 = 635

Number of regular seat sold:
1170 - 635 = 535

Answer: 535 regular tickets were sold.

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