0.09 is what percent of 0.8 - 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 0.8 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 0.8, so we can write it down as 100%=0.8.
4. We know, that x% equals 0.09 of the output value, so we can write it down as x%=0.09.
5. Now we have two simple equations:
1) 100%=0.8
2) x%=0.09
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%=0.8/0.09
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.09 is what percent of 0.8

100%/x%=0.8/0.09
(100/x)*x=(0.8/0.09)*x       - we multiply both sides of the equation by x
100=8.8888888888889*x       - we divide both sides of the equation by (8.8888888888889) to get x
100/8.8888888888889=x
11.25=x
x=11.25

now we have:
0.09 is 11.25% of 0.8