What is 0.399 percent of 2.5 - 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 2.5 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 2.5 is 100%, so we can write it down as 2.5=100%.
4. We know, that x is 0.399% of the output value, so we can write it down as x=0.399%.
5. Now we have two simple equations:
1) 2.5=100%
2) x=0.399%
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:
2.5/x=100%/0.399%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 0.399% of 2.5

2.5/x=100/0.399
(2.5/x)*x=(100/0.399)*x       - we multiply both sides of the equation by x
2.5=250.62656641604*x       - we divide both sides of the equation by (250.62656641604) to get x
2.5/250.62656641604=x
0.009975=x
x=0.009975

now we have:
0.399% of 2.5=0.009975