Most advertising experts say that,unless a small company does not spend more than $30,000 a year on advertising,it probably doesn't need an ad agency.

Question

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The statement contains a double negative ("unless" and "does not"), which makes it confusing. The correct interpretation should be that if a small company spends more than $30,000 a year on advertising, it might need an ad agency.

Most Advertising Experts Say That,unless a Small Company Does Not