The business done this month amounts to ten thousand dollars as against eight thousand dollars last

题目

The business done this month amounts to ten thousand dollars as against eight thousand dollars last month.
请问这个句子中的as against作什么成分?
非常感谢!

答案

as against eight thousand dollars last month.
完整的句子是 as it is against eight thousand dollars last month.--------用作比较,做状语.
===as it is compared with eight thousand dollars last month.