What percent of \(5x\) is equal to \(x/5\)?
(x/5) / (5x) = 1/25 =0.04 x 100 =4%
Lets say x=1
So now the question is : "What percent of 5 is equal to 1/5"
Multiply 5 by 20 so it is 100, it is easier to find the percentage when it is 100. Also multiply 1/5 by 100 too.
Now what percent of 100 is 4?
The answer is obviosuly 4%