2.0E+20 is what percent of 5.0E+21 - 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 5.0E+21 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 100% equals 5.0E+21, so we can write it down as 100%=5.0E+21.
4. We know, that x% equals 2.0E+20 of the output value, so we can write it down as x%=2.0E+20.
5. Now we have two simple equations:
1) 100%=5.0E+21
2) x%=2.0E+20
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:
100%/x%=5.0E+21/2.0E+20
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 2.0E+20 is what percent of 5.0E+21

100%/x%=5.0E+21/2.0E+20
(100/x)*x=(5.0E+21/2.0E+20)*x       - we multiply both sides of the equation by x
100=25*x       - we divide both sides of the equation by (25) to get x
100/25=x
4=x
x=4

now we have:
2.0E+20 is 4% of 5.0E+21