0.1 is what percent of 21000000 - 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 21000000 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 21000000, so we can write it down as 100%=21000000.
4. We know, that x% equals 0.1 of the output value, so we can write it down as x%=0.1.
5. Now we have two simple equations:
1) 100%=21000000
2) x%=0.1
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%=21000000/0.1
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.1 is what percent of 21000000

100%/x%=21000000/0.1
(100/x)*x=(21000000/0.1)*x       - we multiply both sides of the equation by x
100=210000000*x       - we divide both sides of the equation by (210000000) to get x
100/210000000=x
4.7619047619048E-7=x
x=4.7619047619048E-7

now we have:
0.1 is 4.7619047619048E-7% of 21000000