The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion do

题目

The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
请问句中,从at到dollars 这里,如果是状语的话,请问是否为介词短语做伴随状语?如果不是麻烦请指出是什么状语,

答案

应该是方式状语