Final answer:
To convert a percent to a fraction, write the percent as a fraction with a denominator of 100 and simplify the fraction if possible. 0.4 percent 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 and simplify the fraction if possible. For example, to express 0.4 percent as a fraction, we write it as 0.4/100. Then, we simplify the fraction by dividing both the numerator and denominator by the greatest common factor, which in this case is 10. So, 0.4 percent is equivalent to 0.4/100, which simplifies to 1/250.