According to question,
The population of males below poverty line in State B = 500
As per given graph,
Proportion of Male and Female below poverty line in State B = 5 : 7
If 5 Male below poverty line then total population will be 12 in State B
If 1 Male below poverty line then total population will be 12/5 in State B
If 500 Male below poverty line then total population will be 12 x 500 / 5 in State B
Population of State B below poverty line = 500 x 12 / 5 = 100 x 12 = 1200
Percentage population below poverty line in State B = 15 % ( As given in table chart)
∴ Total population of State B = 1200 x 100 / 15 = 80 x 100 = 8000