The units of Manganese Plus available for sale during the year were as follows: 
There are 15 units of the product in the physical inventory at November 30. The periodic inventory system is used. Determine the difference in gross profit between the LIFO and FIFO inventory cost systems.
Definitions:
Punishment
The imposition of a penalty as retribution for an offense or undesirable behavior.
Negative Reinforcement
A behavioral technique in which the removal of an undesirable outcome or stimulus increases the likelihood of a behavior being repeated.
Omission
The act of excluding or leaving out something, either intentionally or unintentionally.
Size of the Punisher
This does not refer to a commonly recognized concept or term within psychological, educational, or disciplinary contexts and may need clarification.
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