8.1 is what percent of 215.7 - 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 215.7 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 215.7, so we can write it down as 100%=215.7.
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%=215.7
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%=215.7/8.1
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 215.7

100%/x%=215.7/8.1
(100/x)*x=(215.7/8.1)*x       - we multiply both sides of the equation by x
100=26.62962962963*x       - we divide both sides of the equation by (26.62962962963) to get x
100/26.62962962963=x
3.7552155771905=x
x=3.7552155771905

now we have:
8.1 is 3.7552155771905% of 215.7