0.15 is what percent of 639.99 - 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 639.99 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 639.99, so we can write it down as 100%=639.99.
4. We know, that x% equals 0.15 of the output value, so we can write it down as x%=0.15.
5. Now we have two simple equations:
1) 100%=639.99
2) x%=0.15
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%=639.99/0.15
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.15 is what percent of 639.99

100%/x%=639.99/0.15
(100/x)*x=(639.99/0.15)*x       - we multiply both sides of the equation by x
100=4266.6*x       - we divide both sides of the equation by (4266.6) to get x
100/4266.6=x
0.02343786621666=x
x=0.02343786621666

now we have:
0.15 is 0.02343786621666% of 639.99