What is 2.5E+15 percent of 0.5 - 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 0.5 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 0.5 is 100%, so we can write it down as 0.5=100%.
4. We know, that x is 2.5E+15% of the output value, so we can write it down as x=2.5E+15%.
5. Now we have two simple equations:
1) 0.5=100%
2) x=2.5E+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:
0.5/x=100%/2.5E+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 2.5E+15% of 0.5

0.5/x=100/2.5E+15
(0.5/x)*x=(100/2.5E+15)*x       - we multiply both sides of the equation by x
0.5=4.0E-14*x       - we divide both sides of the equation by (4.0E-14) to get x
0.5/4.0E-14=x
12500000000000=x
x=12500000000000

now we have:
2.5E+15% of 0.5=12500000000000