What is 5.0E-21 percent of 8000000000000 - 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 8000000000000 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 8000000000000 is 100%, so we can write it down as 8000000000000=100%.
4. We know, that x is 5.0E-21% of the output value, so we can write it down as x=5.0E-21%.
5. Now we have two simple equations:
1) 8000000000000=100%
2) x=5.0E-21%
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:
8000000000000/x=100%/5.0E-21%
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 5.0E-21% of 8000000000000

8000000000000/x=100/5.0E-21
(8000000000000/x)*x=(100/5.0E-21)*x       - we multiply both sides of the equation by x
8000000000000=2.0E+22*x       - we divide both sides of the equation by (2.0E+22) to get x
8000000000000/2.0E+22=x
4.0E-10=x
x=4.0E-10

now we have:
5.0E-21% of 8000000000000=4.0E-10