An opera house has 150 rows; each row has ten seats. The ticket costs $10 per show. How much did the opera house earn from one of the shows if 20% of the seats were not taken? Let's answer step by step:
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The opera house has 150 x 10 = 1500 seats. There are 1500 x 20 / 100 = 300 seats that were not taken. The total number of seats taken was 1500 - 300 = 1200. Therefore, the opera house earned $10 x 1200 = $12000 from one of the shows. The answer: 12000.
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