请教一个语法

Bihar is India's poorest state, with an annual per capita income of $111, lower than that of the most impoverished countries of the world.

这里面lower后面的在整个句子中怎么理解他的成分？我怎么就看不懂呢？难道with后面所有的合起来修饰state么？那lower后面的部分在整个with句子里面怎么理解？

Bihar is India's poorest state because its annual per capita income of $111 is lower than that of the most impoverished countries of the world.

把副詞子句改成介係詞片語變成插入句,來說明Bihar是印度最窮的省分這件事

lower这句修饰an annual per capital income,形容词省略结构

1.       Once common throughout the Western plains, black-footed ferrets are thought to have declined in number as a result of the poisoning of prairie dogs, their prey.

(A) black-footed ferrets are thought to have declined in number as

(B) it is thought that the decline in number of black-footed ferrets is

(C) the decline in the number of black-footed ferrets is thought of as

(D) that black-footed ferrets have declined in their numbers is thought to be（A）

(E) the numbers of the black-footed ferret are thought to have declined as

可参照这题 common的用法