9.1 is what percent of 80 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 80 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 80, so we can write it down as 100%=80.
4. We know, that x% equals 9.1 of the output value, so we can write it down as x%=9.1.
5. Now we have two simple equations:
1) 100%=80
2) x%=9.1
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=80/9.1
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 9.1 is what percent of 80

100%/x%=80/9.1
(100/x)*x=(80/9.1)*x       - we multiply both sides of the equation by x
100=8.7912087912088*x       - we divide both sides of the equation by (8.7912087912088) to get x
100/8.7912087912088=x
11.375=x
x=11.375

now we have:
9.1 is 11.375% of 80