簡單的exclude文法問題&contract介系詞

Product A is excluded in contract discount price.
A產品不包含在合約折扣價中,上面這句文法對嗎?我有疑問:1.exclude可以直接用主動嗎?2.contract前的介系詞用in對嗎?一般稱合約裡用in contract or on contract?
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