Posted by mandy on Friday, October 19, 2007 at 9:14am.
always always always, MC=MR.
First rearrange the demand function to be P=f(Q). That is P=300 - 3Q
Now then Total revenue is P*Q. So TR=300Q -3(Q^2)
MR is the first derivitive of TR. So MR=300 - 6Q
MC is the first derivitive of TC. So MC=(1/2)Q
MC=MR - use algebra and solve for Q. Take it from here
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