215.99 is what percent of 239.99 - 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 239.99 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 239.99, so we can write it down as 100%=239.99.
4. We know, that x% equals 215.99 of the output value, so we can write it down as x%=215.99.
5. Now we have two simple equations:
1) 100%=239.99
2) x%=215.99
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%=239.99/215.99
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 215.99 is what percent of 239.99

100%/x%=239.99/215.99
(100/x)*x=(239.99/215.99)*x       - we multiply both sides of the equation by x
100=1.1111162553822*x       - we divide both sides of the equation by (1.1111162553822) to get x
100/1.1111162553822=x
89.999583315972=x
x=89.999583315972

now we have:
215.99 is 89.999583315972% of 239.99