Write 0.25% as a fraction or mixed number in simplest form.

1/4 is it's fraction in simplest form.

Notice here, that this is 0.25%.

If this was 0.25 alone, the answer would be 1/4.

However, this is 0.25%, which is much, much more smaller than just 0.25.

0.25 is 1/4 of 1. 1 is 1/100 of 100.

Multiply them together, and:

Thus 0.25 is 1/400 of 100.