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An average person takes 18 breaths per minute and each breath exhales 0.0016 m³ of air containing 4% CO₂. At the start of a seminar with 300 participants, the room air contains 0.4% CO₂. The ventilation system delivers 10 m³ of air per minute to the 1500-m³ room. Find an expression for the concentration level of CO2 in the room.

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