What is 999 percent of 1.0E+18 - 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 1.0E+18 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 1.0E+18 is 100%, so we can write it down as 1.0E+18=100%.
4. We know, that x is 999% of the output value, so we can write it down as x=999%.
5. Now we have two simple equations:
1) 1.0E+18=100%
2) x=999%
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:
1.0E+18/x=100%/999%
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 999% of 1.0E+18

1.0E+18/x=100/999
(1.0E+18/x)*x=(100/999)*x       - we multiply both sides of the equation by x
1.0E+18=0.1001001001001*x       - we divide both sides of the equation by (0.1001001001001) to get x
1.0E+18/0.1001001001001=x
9.99E+18=x
x=9.99E+18

now we have:
999% of 1.0E+18=9.99E+18