9.9 is what percent of 39.9 - 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 39.9 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 39.9, so we can write it down as 100%=39.9.
4. We know, that x% equals 9.9 of the output value, so we can write it down as x%=9.9.
5. Now we have two simple equations:
1) 100%=39.9
2) x%=9.9
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%=39.9/9.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 9.9 is what percent of 39.9

100%/x%=39.9/9.9
(100/x)*x=(39.9/9.9)*x       - we multiply both sides of the equation by x
100=4.030303030303*x       - we divide both sides of the equation by (4.030303030303) to get x
100/4.030303030303=x
24.812030075188=x
x=24.812030075188

now we have:
9.9 is 24.812030075188% of 39.9