00:01
All right, so we have this problem here.
00:03
We're given a revenue equation where x is the tax rate and capital r is the revenue.
00:12
All right, we want to find the revenue in tens of millions of dollars.
00:20
Okay, so we'll mark that down, and then we'll get working on calculating these values.
00:34
Now, this is a calculator active question.
00:36
You want to make sure you have a calculator that you can do these evaluations for it.
00:39
Now for part a, what we need to do is we need to substitute 55, not .55.
00:47
That's a mistake that people are going to make here.
00:50
It does say that in the text of the problem, that x is between 0 and 100, not between 0 and 1.
00:57
So for letter a, we want to do r of 55, not r of 0 .55.
01:03
So we do r of 55.
01:05
That's 80 times 55 minus 8 ,000.
01:13
Divided by 55 minus 110.
01:23
All right, now make sure when you enter into the calculator that use parentheses, parentheses around the entire numerator, parentheses around the entire denominator.
01:32
All right, we did this evaluation.
01:36
We get that r of 55 is about 65 .5 tens of millions...