21 is what percent of 8171 - step by step solution

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To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 8171 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 8171, so we can write it down as 100%=8171.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=8171
2) x%=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%=8171/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 21 is what percent of 8171

100%/x%=8171/21
(100/x)*x=(8171/21)*x       - we multiply both sides of the equation by x
100=389.09523809524*x       - we divide both sides of the equation by (389.09523809524) to get x
100/389.09523809524=x
0.25700648635418=x
x=0.25700648635418

now we have:
21 is 0.25700648635418% of 8171

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