What is 2.8 percent of 15 - 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 15 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 15 is 100%, so we can write it down as 15=100%.
4. We know, that x is 2.8% of the output value, so we can write it down as x=2.8%.
5. Now we have two simple equations:
1) 15=100%
2) x=2.8%
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:
15/x=100%/2.8%
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 2.8% of 15

15/x=100/2.8
(15/x)*x=(100/2.8)*x       - we multiply both sides of the equation by x
15=35.7142857143*x       - we divide both sides of the equation by (35.7142857143) to get x
15/35.7142857143=x
0.42=x
x=0.42

now we have:
2.8% of 15=0.42