Asked by jake

The profit obtained when x barbecues are sold is
P(x) = 100 x − 3x^2 (lnx) dollars . Find the marginal profit when 4 are sold.
Answered by Reiny
P(4) =
100(4) - 3(16)ln(4)
= ..

I assume you have a calculator to get appr 333.46
Answered by Steve
the marginal profit is

dP/dx = 100 - 6x lnx - 3x

so, now plug in x=4
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