00:01
So given here demand function is demand function is let's say that is p and that is equal to given here 60 minus 2q.
00:12
Now we know that revenue function let's say revenue function is rx and we know that that is equal to we have here p into so from here we can write that is the value of p is 60 minus 2q multiplied by q.
00:33
So from here we can write 60q minus 2q square and that is our revenue function.
00:44
Now we have to find our cost function and we know that cost function is represented by let's say cx and that is equal to we have fixed cost plus variable cost and given here our fixed cost is 70 and variable cost is 18 and variable here is a variable so multiply by q.
01:06
Now we have to find here profit p.
01:10
So profit p is equal to then profit is equal to we know that a revenue cost revenue function minus cost function.
01:20
So that gives us we have here 60q minus 2q square minus 17 minus 70 minus 18q.
01:35
So from here we can say that our profit is equal to then we have here 42q minus 2q square minus 70.
01:47
Now we have to find here the marginal cost.
01:50
So the marginal cost is or we can say the marginal profit is now we have to find here the marginal profit.
01:58
So marginal profit is equal to differentiation of profit so that we can write here dp upon dq with respect to q.
02:08
So our dp upon dq gives us here that is 42 minus 4q...