| Microsoft Corp.'s William H. Gates took a leap of faith and invested $1 billion in Comcast Corp. three years ago. Now it's easy to see why: Acquisitions and new products, such as digital cable and high-speed Internet service, have boosted net income 42.5% annually in the past three years. Comcast, the third-largest cable company, which owns the qvc home-shopping channel, posted a healthy margin of 24.9%. As a result, Comcast vaulted to No.41 this year from No.201. Forget the cubic zirconia. That's a real gem of a performance.
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