Final answer:
To convert 0.4% to a fraction, it is equivalent to 1/250.
Step-by-step explanation:
To convert a percent to a fraction, we write the percent as a fraction with a denominator of 100. In this case, 0.4% can be written as 0.4/100. Simplifying the fraction by dividing both the numerator and denominator by 0.4, we get 1/250. Therefore, 0.4% is equivalent to 1/250.
Learn more about Converting percent to fraction