42.99 is what percent of 315.99 - 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 315.99 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 315.99, so we can write it down as 100%=315.99.
4. We know, that x% equals 42.99 of the output value, so we can write it down as x%=42.99.
5. Now we have two simple equations:
1) 100%=315.99
2) x%=42.99
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%=315.99/42.99
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 42.99 is what percent of 315.99

100%/x%=315.99/42.99
(100/x)*x=(315.99/42.99)*x       - we multiply both sides of the equation by x
100=7.3503140265178*x       - we divide both sides of the equation by (7.3503140265178) to get x
100/7.3503140265178=x
13.60486091332=x
x=13.60486091332

now we have:
42.99 is 13.60486091332% of 315.99