What is 2.0E-9 percent of 3.09E-7 - 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 3.09E-7 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 3.09E-7 is 100%, so we can write it down as 3.09E-7=100%.
4. We know, that x is 2.0E-9% of the output value, so we can write it down as x=2.0E-9%.
5. Now we have two simple equations:
1) 3.09E-7=100%
2) x=2.0E-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:
3.09E-7/x=100%/2.0E-9%
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 2.0E-9% of 3.09E-7

3.09E-7/x=100/2.0E-9
(3.09E-7/x)*x=(100/2.0E-9)*x       - we multiply both sides of the equation by x
3.09E-7=50000000000*x       - we divide both sides of the equation by (50000000000) to get x
3.09E-7/50000000000=x
6.18E-18=x
x=6.18E-18

now we have:
2.0E-9% of 3.09E-7=6.18E-18