Washington Post Co.’s sale of its flagship newspaper to billionaire Jeff Bezos rids the company of its weakest division, letting it focus on a once high-flying education business now beset by government scrutiny.

The Washington-based company draws about 55 percent of its $4 billion in annual revenue from its education unit, including its Kaplan chain of for-profit colleges, whose sales tumbled 9 percent to $2.2 billion last year.

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