Suppose PY is 16 but there is an inflow of population that increases Pop from 124 to 248. Consider the welfare of the people who originally reside in the country. Before the increase in population, the total consumer surplus to them is 5169.61. After the increase in population from (124 to 248) due to the inflow of immigrants, the total consumer surplus to the people who originally reside in the country is [Answer] (dollars).
(In decimal numbers, with two decimal places, please.)