Use the table below to answer the following question. 
Average total cost is at a minimum when the output level is
Definitions:
Nucleophilic
Pertaining to a molecule or ion that donates an electron pair to form a chemical bond in reaction.
Substitution Reaction
A chemical reaction where one functional group in a chemical compound is replaced by another.
Mechanism
A mechanism is a description of the step-by-step process by which reactants are transformed into products in a chemical reaction, including the intermediate stages and transition states.
Anionic Nucleophiles
Negatively charged species that donate an electron pair to electrophiles in chemical reactions.
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