CREATE TABLE table_25042332_16 (below_50_percentage_of_median_income VARCHAR(255), below_40_percentage_of_median_income VARCHAR(255))
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?
    
SQL: SELECT COUNT(below_50_percentage_of_median_income) FROM table_25042332_16 WHERE below_40_percentage_of_median_income = "10.4%"