39.91 is what percent of 42.5 - 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 42.5 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 42.5, so we can write it down as 100%=42.5.
4. We know, that x% equals 39.91 of the output value, so we can write it down as x%=39.91.
5. Now we have two simple equations:
1) 100%=42.5
2) x%=39.91
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%=42.5/39.91
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 39.91 is what percent of 42.5

100%/x%=42.5/39.91
(100/x)*x=(42.5/39.91)*x       - we multiply both sides of the equation by x
100=1.0648960160361*x       - we divide both sides of the equation by (1.0648960160361) to get x
100/1.0648960160361=x
93.905882352941=x
x=93.905882352941

now we have:
39.91 is 93.905882352941% of 42.5