28 is what percent of 21390 - 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 21390 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 21390, so we can write it down as 100%=21390.
4. We know, that x% equals 28 of the output value, so we can write it down as x%=28.
5. Now we have two simple equations:
1) 100%=21390
2) x%=28
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%=21390/28
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 28 is what percent of 21390

100%/x%=21390/28
(100/x)*x=(21390/28)*x       - we multiply both sides of the equation by x
100=763.92857142857*x       - we divide both sides of the equation by (763.92857142857) to get x
100/763.92857142857=x
0.13090229079009=x
x=0.13090229079009

now we have:
28 is 0.13090229079009% of 21390