78 is what percent of 3100 - 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 3100 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 3100, so we can write it down as 100%=3100.
4. We know, that x% equals 78 of the output value, so we can write it down as x%=78.
5. Now we have two simple equations:
1) 100%=3100
2) x%=78
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%=3100/78
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 78 is what percent of 3100

100%/x%=3100/78
(100/x)*x=(3100/78)*x       - we multiply both sides of the equation by x
100=39.74358974359*x       - we divide both sides of the equation by (39.74358974359) to get x
100/39.74358974359=x
2.5161290322581=x
x=2.5161290322581

now we have:
78 is 2.5161290322581% of 3100