SEOUL — Samsung Electronics Co. is forecasting a roughly 52% jump in its fourth-quarter operating profit from the year-ago period, lifted by resilient demand for memory chips and improved returns from its contract chip-making business.

The world’s largest smartphone and memory-chip maker expects operating profit of about 13.8 trillion South Korean won, equivalent to about $11.4 billion, for the quarter ended Dec. 31. That compares with about 9.05 trillion won for the year-earlier quarter.

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