need ur help on marginal revnue as a derivative of total revenue

If TR= 400q1-qi^2-q1q2, can you show me step by step how the marginal revenue is derived? thanks a lot in advance.

with respect to what are you deriving this? q1 or q2? its a simple exercise in differentiation.

q1. Pls show me how simple it is. Thanks in advance.

Specifically, I want to see the long-hand derivation.

go do it yourself… this is not testedon the exam

@saulherman how can you say it is not going to be tested when it is part of the curriculum? How do we calculate the price if we don’t know how the marginal value is derived?

Are you taking the exam on December 2011?

@Spongebob, no. I’ve just started reviewing for the June 2012 exam.