What is 4.0E-5 percent of 625 - 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 625 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 625 is 100%, so we can write it down as 625=100%.
4. We know, that x is 4.0E-5% of the output value, so we can write it down as x=4.0E-5%.
5. Now we have two simple equations:
1) 625=100%
2) x=4.0E-5%
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:
625/x=100%/4.0E-5%
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 4.0E-5% of 625

625/x=100/4.0E-5
(625/x)*x=(100/4.0E-5)*x       - we multiply both sides of the equation by x
625=2500000*x       - we divide both sides of the equation by (2500000) to get x
625/2500000=x
0.00025=x
x=0.00025

now we have:
4.0E-5% of 625=0.00025