81 is what percent of 100 - step by step solution

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To get the solution, we are looking for, we need to point out what we know.

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

7. Solution for 81 is what percent of 100

100%/x%=100/81
(100/x)*x=(100/81)*x - we multiply both sides of the equation by x
100=1.23456790123*x - we divide both sides of the equation by (1.23456790123) to get x
100/1.23456790123=x
81=x
x=81

now we have:
81 is 81% of 100

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