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?
create table table_25042332_16 (below_50_percentage_of_median_income varchar, below_40_percentage_of_median_income varchar, PRIMARY KEY (below_50_percentage_of_median_income))
select count(below_50_percentage_of_median_income) from table_25042332_16 where below_40_percentage_of_median_income = "10.4%"