Express the given fraction as a percent. $\frac{2}{5}$ \[ \frac{2}{5}=\square \% \]

Step 1 ：Express the given fraction as a percent: \(\frac{2}{5}\).

Step 2 ：To convert a fraction to a percentage, we need to divide the numerator by the denominator and then multiply the result by 100.

Step 3 ：numerator = 2

Step 4 ：denominator = 5

Step 5 ：percentage = \(\frac{numerator}{denominator} \times 100\) = 40.0

Step 6 ：Final Answer: \(\frac{2}{5}= \boxed{40\%}\)