So, we're looking for 0.4% of 40. First, let's convert 0.4% to a decimal. Since a percent is really just PARTS of one hundred, this decimal really means 0.4/100. 0.4 divided by 100 is 0.004. Next, we need to figure out how to solve this problem! To find a percent of a number, just multiply the percent (in decimal form) by the number! So, we need to answer 0.004*40, which equals 0.16.
Answer: 0.16