The phone bill for a company consists of both fixed and variable costs.Refer to the 4-month data below and apply the high-low method to answer the question. 
-What is the variable cost per minute?
Definitions:
Infrared Energy
Electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves, perceived as heat.
Atmospheric
Pertaining to the Earth's atmosphere, it encompasses all the layers of gas surrounding the planet, crucial for weather and climate conditions.
Yearly Variations
Changes that occur on an annual basis in various environmental or climatic factors, such as temperature, precipitation, and day length.
Playa
A shallow, closed basin in a generally dry environment.
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