Fears over a trade war continued to rock Wall Street as China promised $3 billion in tariffs on U.S.  goods. So which U.S. companies are at risk? Apple could be hit the hardest with 20% of its profits last quarter coming from China. Boeing sales there brought in $12 billion, and Starbucks says 14% of its sales came from China  and sales there are growing at a faster pace than in the U.S.

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