12.91 is what percent of 18.99 - 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 18.99 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 18.99, so we can write it down as 100%=18.99.
4. We know, that x% equals 12.91 of the output value, so we can write it down as x%=12.91.
5. Now we have two simple equations:
1) 100%=18.99
2) x%=12.91
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%=18.99/12.91
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 12.91 is what percent of 18.99

100%/x%=18.99/12.91
(100/x)*x=(18.99/12.91)*x       - we multiply both sides of the equation by x
100=1.4709527498064*x       - we divide both sides of the equation by (1.4709527498064) to get x
100/1.4709527498064=x
67.983149025803=x
x=67.983149025803

now we have:
12.91 is 67.983149025803% of 18.99