0.21 is what percent of 2.05 - 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 2.05 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 2.05, so we can write it down as 100%=2.05.
4. We know, that x% equals 0.21 of the output value, so we can write it down as x%=0.21.
5. Now we have two simple equations:
1) 100%=2.05
2) x%=0.21
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:
100%/x%=2.05/0.21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.21 is what percent of 2.05

100%/x%=2.05/0.21
(100/x)*x=(2.05/0.21)*x       - we multiply both sides of the equation by x
100=9.7619047619048*x       - we divide both sides of the equation by (9.7619047619048) to get x
100/9.7619047619048=x
10.243902439024=x
x=10.243902439024

now we have:
0.21 is 10.243902439024% of 2.05