Answer: 40%
Step-by-step explanation: To write a fraction as a percent, first remember that a percent is a ratio of a number to 100. If we want to write 2/5 as a percent, we need to find a fraction equivalent to 2/5 with a 100 in the denominator. We can do this by setting up a proportion.

Now, we can use cross products to find the missing value.
200 = 5n
÷5 ÷5 ← divide both sides by 5
40 = n
Therefore, 2/5 is equivalent to 40%.