90 is what percent of 77.1 - 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 77.1 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 77.1, so we can write it down as 100%=77.1.
4. We know, that x% equals 90 of the output value, so we can write it down as x%=90.
5. Now we have two simple equations:
1) 100%=77.1
2) x%=90
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%=77.1/90
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 90 is what percent of 77.1

100%/x%=77.1/90
(100/x)*x=(77.1/90)*x       - we multiply both sides of the equation by x
100=0.85666666666667*x       - we divide both sides of the equation by (0.85666666666667) to get x
100/0.85666666666667=x
116.73151750973=x
x=116.73151750973

now we have:
90 is 116.73151750973% of 77.1