0.21 is what percent of 7.98 - 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 7.98 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 7.98, so we can write it down as 100%=7.98.
4. We know, that x% equals 0.21 of the output value, so we can write it down as x%=0.21.
5. Now we have two simple equations:
1) 100%=7.98
2) x%=0.21
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%=7.98/0.21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 0.21 is what percent of 7.98

100%/x%=7.98/0.21
(100/x)*x=(7.98/0.21)*x       - we multiply both sides of the equation by x
100=38*x       - we divide both sides of the equation by (38) to get x
100/38=x
2.6315789473684=x
x=2.6315789473684

now we have:
0.21 is 2.6315789473684% of 7.98