0.42 is what percent of 21.45 - 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 21.45 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 21.45, so we can write it down as 100%=21.45.
4. We know, that x% equals 0.42 of the output value, so we can write it down as x%=0.42.
5. Now we have two simple equations:
1) 100%=21.45
2) x%=0.42
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%=21.45/0.42
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.42 is what percent of 21.45

100%/x%=21.45/0.42
(100/x)*x=(21.45/0.42)*x       - we multiply both sides of the equation by x
100=51.071428571429*x       - we divide both sides of the equation by (51.071428571429) to get x
100/51.071428571429=x
1.958041958042=x
x=1.958041958042

now we have:
0.42 is 1.958041958042% of 21.45