What is 20.77 percent of 390 - 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 390 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 390 is 100%, so we can write it down as 390=100%.
4. We know, that x is 20.77% of the output value, so we can write it down as x=20.77%.
5. Now we have two simple equations:
1) 390=100%
2) x=20.77%
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:
390/x=100%/20.77%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 20.77% of 390

390/x=100/20.77
(390/x)*x=(100/20.77)*x       - we multiply both sides of the equation by x
390=4.8146364949446*x       - we divide both sides of the equation by (4.8146364949446) to get x
390/4.8146364949446=x
81.003=x
x=81.003

now we have:
20.77% of 390=81.003