A is 倍数 as+ adj+ as B/A is 倍数 + adj比较级 + than B的状语从句中,常会有一些成分在上下文清楚的情况下被省略掉.如：
He had mad greater progress than (he did) before.
I like the black one.The blue one isn't as good (as the black one).
此题省略了 as the original price（原价）