What is 15.78 percent of 129 - 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 129 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 129 is 100%, so we can write it down as 129=100%.
4. We know, that x is 15.78% of the output value, so we can write it down as x=15.78%.
5. Now we have two simple equations:
1) 129=100%
2) x=15.78%
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:
129/x=100%/15.78%
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 15.78% of 129

129/x=100/15.78
(129/x)*x=(100/15.78)*x       - we multiply both sides of the equation by x
129=6.3371356147022*x       - we divide both sides of the equation by (6.3371356147022) to get x
129/6.3371356147022=x
20.3562=x
x=20.3562

now we have:
15.78% of 129=20.3562