How to Calculate Maximum Profit

Suppose:
P = 120 - 0,02 Q
C = 60 Q + 25000

where P is per unit price, Q is quantity, and C is total costs.
TR = Total Revenue
MR = Marginal Revenue
MC - Marginal Cost
How do we get the maximum profit?

Answer:

TR = P x Q
      = (120 - 0,02 Q)Q
TR = 120Q - 0,02Q2
MR = TR'

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