Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25042332_16 ( below_50_percentage_of_median_income VARCHAR, below_40_percentage_of_median_income VARCHAR )

### Question ###
What percentage of the population is below 50% of the median income in the region where 10.4% of the population earns below 40% of the median income?

### Accurate SQL ###

SELECT COUNT(below_50_percentage_of_median_income) FROM table_25042332_16 WHERE below_40_percentage_of_median_income = "10.4%"