2.55 is what percent of 39.9 - 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 39.9 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 39.9, so we can write it down as 100%=39.9.
4. We know, that x% equals 2.55 of the output value, so we can write it down as x%=2.55.
5. Now we have two simple equations:
1) 100%=39.9
2) x%=2.55
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%=39.9/2.55
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 2.55 is what percent of 39.9

100%/x%=39.9/2.55
(100/x)*x=(39.9/2.55)*x       - we multiply both sides of the equation by x
100=15.647058823529*x       - we divide both sides of the equation by (15.647058823529) to get x
100/15.647058823529=x
6.390977443609=x
x=6.390977443609

now we have:
2.55 is 6.390977443609% of 39.9