13.21 is what percent of 39.99 - 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 39.99 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 39.99, so we can write it down as 100%=39.99.
4. We know, that x% equals 13.21 of the output value, so we can write it down as x%=13.21.
5. Now we have two simple equations:
1) 100%=39.99
2) x%=13.21
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%=39.99/13.21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 13.21 is what percent of 39.99

100%/x%=39.99/13.21
(100/x)*x=(39.99/13.21)*x       - we multiply both sides of the equation by x
100=3.0272520817562*x       - we divide both sides of the equation by (3.0272520817562) to get x
100/3.0272520817562=x
33.033258314579=x
x=33.033258314579

now we have:
13.21 is 33.033258314579% of 39.99