Kayla and Kingston run a shuttle service from Water Tower Place to Chicago O'Hare airport. Last month, they recorded the following: 
Kayla and Kingston's gross profit for the past month was
Definitions:
Spirometer
An instrument that measures the air taken in and expelled from the lungs.
Lungs
Pair of respiratory organs in the chest of vertebrates where blood is oxygenated.
Air
The unseen mixture of gases that envelops the Earth, primarily composed of oxygen and nitrogen.
P Wave
A component of an electrocardiogram (ECG) representing the depolarization of the atria preceding a heartbeat.
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