What is 50000000000 percent of 81000000000 - 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 81000000000 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 81000000000 is 100%, so we can write it down as 81000000000=100%.
4. We know, that x is 50000000000% of the output value, so we can write it down as x=50000000000%.
5. Now we have two simple equations:
1) 81000000000=100%
2) x=50000000000%
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:
81000000000/x=100%/50000000000%
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 50000000000% of 81000000000

81000000000/x=100/50000000000
(81000000000/x)*x=(100/50000000000)*x       - we multiply both sides of the equation by x
81000000000=2.0E-9*x       - we divide both sides of the equation by (2.0E-9) to get x
81000000000/2.0E-9=x
4.05E+19=x
x=4.05E+19

now we have:
50000000000% of 81000000000=4.05E+19