00:01
Okay, so revenue is x times the demand function, right? so it becomes 3000x minus 8x squared.
00:13
And the profit is revenue minus cost.
00:19
So that's going to be revenue is 3000x minus 8x squared minus 12 ,000 minus 600x minus plus 3 .2x squared minus 0 .004x cubed.
00:41
And we can reduce some of these, right? and these two.
00:50
So we have negative 4 .8x squared here.
00:55
Okay, now we're going to take derivative of this with respect to x.
01:00
By the way, right here, if we take derivative with respect to x, that will be dr dx, which is marginal revenue over dc dx, which is marginal cost.
01:09
We're doing the same thing...