If the amount of carbon dioxide in a workplace is greater than 1000 parts per million (ppm), it can cause drowsiness and complaints of stale air. Write an inequality to show the amount of (c) in parts per million that would cause drowsiness and complaints of stale air.

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c < 1000 ppm
c > 1000 ppm
c = 1000 ppm
c > 2 ppm