What is 3.15 percent of 396.9 - 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 396.9 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 396.9 is 100%, so we can write it down as 396.9=100%.
4. We know, that x is 3.15% of the output value, so we can write it down as x=3.15%.
5. Now we have two simple equations:
1) 396.9=100%
2) x=3.15%
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:
396.9/x=100%/3.15%
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 3.15% of 396.9

396.9/x=100/3.15
(396.9/x)*x=(100/3.15)*x       - we multiply both sides of the equation by x
396.9=31.746031746032*x       - we divide both sides of the equation by (31.746031746032) to get x
396.9/31.746031746032=x
12.50235=x
x=12.50235

now we have:
3.15% of 396.9=12.50235