8.1 is what percent of 315 - 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 315 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 315, so we can write it down as 100%=315.
4. We know, that x% equals 8.1 of the output value, so we can write it down as x%=8.1.
5. Now we have two simple equations:
1) 100%=315
2) x%=8.1
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%=315/8.1
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 8.1 is what percent of 315

100%/x%=315/8.1
(100/x)*x=(315/8.1)*x       - we multiply both sides of the equation by x
100=38.888888888889*x       - we divide both sides of the equation by (38.888888888889) to get x
100/38.888888888889=x
2.5714285714286=x
x=2.5714285714286

now we have:
8.1 is 2.5714285714286% of 315

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