12.39 is what percent of 13 - 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 13 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 13, so we can write it down as 100%=13.
4. We know, that x% equals 12.39 of the output value, so we can write it down as x%=12.39.
5. Now we have two simple equations:
1) 100%=13
2) x%=12.39
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%=13/12.39
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 12.39 is what percent of 13

100%/x%=13/12.39
(100/x)*x=(13/12.39)*x       - we multiply both sides of the equation by x
100=1.0492332526231*x       - we divide both sides of the equation by (1.0492332526231) to get x
100/1.0492332526231=x
95.307692307692=x
x=95.307692307692

now we have:
12.39 is 95.307692307692% of 13