To solve this problem, let's start with the given equation:
\[ 20\% \text{ of } x = y \]
This can be written as:
\[ 0.2x = y \]
Now, we need to find \( y\% \text{ of } 20 \). This can be expressed as:
\[ \frac{y}{100} \times 20 \]
Substitute \( y = 0.2x \) into the equation:
\[ \frac{0.2x}{100} \times 20 \]
Simplify the expression:
\[ \frac{0.2x \times 20}{100} = \frac{4x}{100} = 0.04x \]
So, \( y\% \text{ of } 20 \) is the same as:
Answer: D (4% of x)