<image>A social survey agency surveyed the monthly income of 10,000 residents in a certain area and drew a frequency distribution histogram of the sample based on the obtained data (as shown in the figure). In order to analyze the relationship between residents' income and age, education level, occupation, etc., the monthly income situation represented by the horizontal axis in the figure is divided into six layers. Then, a stratified sampling method is used to randomly select 100 people from these 10,000 people for further investigation. The number of people to be selected from the (2500, 3000) (yuan) monthly income layer is _________. 