<image>A social survey agency surveyed the monthly income of 10,000 residents in a certain area and drew a sample frequency distribution histogram based on the obtained data (in units of yuan) (as shown in the figure). In order to analyze the relationship between residents' income and factors such as age, education, and occupation, it is necessary to use stratified sampling to extract 100 people from these 10,000 people for further investigation. How many people should be extracted from the [2500, 3500) monthly income range?