Samsung Electronics Co Ltd said on Friday its fourth-quarter profit likely leapt 50 percent from a year earlier to its highest level in more than three years, beating expectations on strong chip sales and a smartphone rebound. The upbeat outlook comes despite a slight fall in revenue and the anticipated $2.1 billion profit hit from the withdrawal of the fire-prone Galaxy Note 7 premium smartphone in October. The guidance points to a more rapid recovery for the mobile business than many analysts had anticipated after one of the biggest product safety failures in tech history, and reflects steady price increases for memory chips.