2.15 is what percent of 28 - 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 28 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 28, so we can write it down as 100%=28.
4. We know, that x% equals 2.15 of the output value, so we can write it down as x%=2.15.
5. Now we have two simple equations:
1) 100%=28
2) x%=2.15
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%=28/2.15
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 2.15 is what percent of 28

100%/x%=28/2.15
(100/x)*x=(28/2.15)*x       - we multiply both sides of the equation by x
100=13.023255813953*x       - we divide both sides of the equation by (13.023255813953) to get x
100/13.023255813953=x
7.6785714285714=x
x=7.6785714285714

now we have:
2.15 is 7.6785714285714% of 28