00:02
Hello, this problem is about a movie theater that has daily fixed costs.
00:11
So we are looking at daily.
00:16
Fixed costs are $5 ,000 per day.
00:26
And the variable cost is six on average, $6 per customer.
00:42
Okay.
00:44
From this we build our cost function.
00:47
C of q, which has this form.
00:52
These are the fixed costs and these are the variable costs.
00:54
So our cost function is going to be c of q is 5 ,000 plus 6.
01:05
Okay.
01:08
Reading the text of the problem.
01:11
We now go and see what the revenue side is.
01:15
So the revenue side is.
01:16
The revenue side is that the charge per ticket is $11.
01:30
Okay, the revenue function has the general form of p times q where p is the price per the price per unit.
01:41
So that is per service rendered or per ticket.
01:45
And q is the number of tickets.
01:46
So r of q is going to be 11 q in this.
01:52
Case okay so mr.
01:57
Nice says asks how many customers what is the customers one of the customers needed for the theater to make a profit making a profit means that the profit is greater than zero now the profit function the profit function is a difference between the revenue and the cost and this is going to be greater than zero when we add c to why the side when r is greater than c.
02:28
So when 11 q, r of q, is greater than c of q, is greater than 5 ,000 plus six q, subtract six q from either side.
02:42
We have 5 q greater than 5 ,000, divide by five in an inequality.
02:51
It's okay to divide.
02:52
It's okay to divide with any number, but except zero.
02:54
5 is positive, so the direction of the inequality remains.
03:00
Q is greater than 1 ,000.
03:03
So in order to make a profit, the number of customers must be greater than 1 ,000.
03:15
This answers question a.
03:19
For question b, we need to graph both c and q, c and r.
03:31
And to mark the break -even point.
03:36
Break -even point.
03:38
What is the break -even point? the break -even point is the cue for which r -f -q equals c -f -q.
03:50
Now, if we had an equality here, we would find that q equals 1 ,000.
03:55
So the q -0 will be 1 ,000.
03:58
Right.
03:59
Let's do some graphing.
04:01
I need to prepare.
04:03
I just hit pause here.
04:06
Okay, let's draw the axes.
04:13
Let's draw the axes on the horizontal axis, we will place q, which will be the number of customers.
04:21
And we will be graphing both r and c, which are in dollars.
04:27
So on the vertical axis, we will place the amount, and this will be the number of tickets sold.
04:37
1000 will be our break -even points.
04:39
So we have, let's say, let's place a thousand here, which would make this 500.
04:49
On the dollar axis, let's take each one of these segments to be $2 ,000.
04:56
4 ,6 ,8, 10 ,000...