8.5 is what percent of 217.8 - 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 217.8 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 217.8, so we can write it down as 100%=217.8.
4. We know, that x% equals 8.5 of the output value, so we can write it down as x%=8.5.
5. Now we have two simple equations:
1) 100%=217.8
2) x%=8.5
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%=217.8/8.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 8.5 is what percent of 217.8

100%/x%=217.8/8.5
(100/x)*x=(217.8/8.5)*x       - we multiply both sides of the equation by x
100=25.623529411765*x       - we divide both sides of the equation by (25.623529411765) to get x
100/25.623529411765=x
3.9026629935721=x
x=3.9026629935721

now we have:
8.5 is 3.9026629935721% of 217.8