Restaurant Brands International Inc. agreed to buy Popeyes Louisiana Kitchen Inc. (Nasdaq: PLKI) for about $1.8 billion, adding a fried-chicken chain to its lineup of burgers and doughnuts.

The cash offer of $79 a share represents a 19 percent premium to Popeyes’ closing price on Feb. 17. The deal is expected to close by early April, the companies said.

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