Use the following figure to answer the question : Figure 9-3 : shows the marginal cost curve,average total cost curve,average variable cost curve,and marginal revenue curve for a firm for different levels of output. 
-In Figure 9-3,maximum profit per unit is equal to _____.
Definitions:
Infect
The process by which organisms, such as bacteria, viruses, fungi, or parasites, enter, invade, and multiply within another organism, causing disease or illness.
Biting Insects
Biting insects are those that pierce the skin of humans or animals to feed on blood; common examples include mosquitoes, flies, and ticks, which can also act as vectors for various diseases.
Charophyte Algae
A group of green algae thought to be the closest relatives of land plants, sharing common traits such as cellular division and photosynthetic pigments.
Closest Relatives
The species or taxonomic group that is most closely related to another in evolutionary terms, sharing a recent common ancestor.
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