10.15 is what percent of 128.99 - 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 128.99 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 128.99, so we can write it down as 100%=128.99.
4. We know, that x% equals 10.15 of the output value, so we can write it down as x%=10.15.
5. Now we have two simple equations:
1) 100%=128.99
2) x%=10.15
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%=128.99/10.15
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 10.15 is what percent of 128.99

100%/x%=128.99/10.15
(100/x)*x=(128.99/10.15)*x       - we multiply both sides of the equation by x
100=12.708374384236*x       - we divide both sides of the equation by (12.708374384236) to get x
100/12.708374384236=x
7.8688270408559=x
x=7.8688270408559

now we have:
10.15 is 7.8688270408559% of 128.99