-- Yes; in fact, you would have to do so . -- The cardinal number is a post-determiner, so seasonally is an adverb and adjusted is an adjective modifying percent (%).
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Mister MicawberDoes the 'a seasonally adjusted 1%' work adverbially?-- The cardinal number is a post-determiner, so seasonally is an adverb and adjusted is an adjective modifying percent (%).Is percent a noun here?