Use the following to answer question: 
-(Figure: Consumer Surplus II) Look at the figure Consumer Surplus II.If the price of the good is $4,consumer surplus will equal:
Definitions:
Level Switch
A device used to detect the level of liquid or solid materials within a container or environment, triggering an action when a certain level is reached.
Temperature Switch
A device that activates or deactivates based on a specific temperature threshold being reached.
Proximity Sensor
A device that detects the presence or absence of a nearby object without physical contact, often using electromagnetic fields, light, or sound.
Photoelectric Sensor
A device that uses light to detect the presence, absence, or distance of an object.
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