00:03
Okay, so the fixed monthly cost to the bakery is $660.
00:21
And the variable cost is $0 .5 per pastry.
00:41
So the cost function will be fixed cost, plus the variable cost multiplies the number of pastry that is made.
01:02
So the number of pastry that is made, we assume the variable is x.
01:09
And the revenue function is, we know the pastry sale for 1 .6 each.
01:17
So the revenue function is r of x equals 1 .6 times x.
01:35
So to write the profit function, that represents the profits for producing a sale.
01:45
X pastries.
01:47
We use, okay, let's call this function p of x.
01:58
So p of x, we use r of x to minus c of x, right? so r of x is 1 .6 times x minus c of x is 660 plus 0 .5 times x.
02:19
Simplify.
02:20
I have 1 .1 times x minus 660.
02:25
So yeah, that is the profit function.
02:32
Actually, based on this, i already know the answer, okay? since there are only one choice that gives the correct function for p of x.
02:43
But let's continue to look at part b...