(2) Take the first derivative of C(q) and substitute it into 120 to calculate the marginal cost at this time. This means that when 120 units are produced, the cost will increase for each additional unit.
2( 1) Find the profit function directly first. Profit is selling price-cost, here is P(q)*q-50000-25q.
The marginal profit function is the first derivative of this function.
2) The marginal profit function obtained by substituting 3000 into the above is the marginal profit.
The significance is that when the number of products is 3000 pieces, the profit will be increased for each piece produced/kloc-0.
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