84 is what percent of 81 - 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 81 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 81, so we can write it down as 100%=81.
4. We know, that x% equals 84 of the output value, so we can write it down as x%=84.
5. Now we have two simple equations:
1) 100%=81
2) x%=84
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%=81/84
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 84 is what percent of 81

100%/x%=81/84
(100/x)*x=(81/84)*x       - we multiply both sides of the equation by x
100=0.96428571428571*x       - we divide both sides of the equation by (0.96428571428571) to get x
100/0.96428571428571=x
103.7037037037=x
x=103.7037037037

now we have:
84 is 103.7037037037% of 81