Marginal Cost is C'(x)
(Number on Unit)(Price) then take derivative
Cost of Producing unit
Plug the unit before. example if you need the cost of producing the 9th unit you'd do C'(8)
To find actual cost of producing the 9th unit you do C(9)-C(8)
To find revenue obtained of the 9th unit is approximated be R'(8)
Actual Revenue Obtained
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