00:01
And cost function for a particular company.
00:03
And it wants to know about the average profit.
00:06
So the first thing we need to do is find our profit.
00:09
Profit is going to be our revenue minus our cost.
00:12
So i'm going to say 25x to the 9th over 10 minus.
00:16
And i want to go ahead and wrap this in parentheses when i subtract it and get 710 minus 30x plus 061x squared.
00:27
So there's our profit function.
00:28
But they're talking about average profit.
00:31
So we need to take each piece and we need to put it over x.
00:34
Because the profit per item, we have x items.
00:39
We're going to be dividing the total profit by x.
00:42
So we're going to simplify this to be 25x to the 8th over 10, minus 710 over x, minus 30 plus 0 .061x.
00:54
So there's going to be our average profit, not prime average.
00:58
We want to know how the average profit is changing, which means we now need to take its derivative.
01:05
So i'm going to say this is, i'm going to rewrite this now.
01:07
It's 25 over 10.
01:12
So i don't know why that's not reduced.
01:16
So i'm going to go ahead and reduce 25 over 10...