What is 0.045 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 81 is 100%, so we can write it down as 81=100%.
4. We know, that x is 0.045% of the output value, so we can write it down as x=0.045%.
5. Now we have two simple equations:
1) 81=100%
2) x=0.045%
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:
81/x=100%/0.045%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 0.045% of 81

81/x=100/0.045
(81/x)*x=(100/0.045)*x       - we multiply both sides of the equation by x
81=2222.2222222222*x       - we divide both sides of the equation by (2222.2222222222) to get x
81/2222.2222222222=x
0.03645=x
x=0.03645

now we have:
0.045% of 81=0.03645