42.39 is what percent of 847.8 - 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 847.8 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 847.8, so we can write it down as 100%=847.8.
4. We know, that x% equals 42.39 of the output value, so we can write it down as x%=42.39.
5. Now we have two simple equations:
1) 100%=847.8
2) x%=42.39
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%=847.8/42.39
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 42.39 is what percent of 847.8

100%/x%=847.8/42.39
(100/x)*x=(847.8/42.39)*x       - we multiply both sides of the equation by x
100=20*x       - we divide both sides of the equation by (20) to get x
100/20=x
5=x
x=5

now we have:
42.39 is 5% of 847.8