Apple shares jumped 3% in premarket trading on Friday after the iPhone maker posted its strongest quarterly sales growth in more than four years, a show ‌of momentum as it prepares to hand over the reins to a new CEO. Its latest ‌iPhone 17 Pro series and the newly launched low-cost MacBook Neo laptop are both drawing buyers at a time of low ​overall demand in the consumer electronics industry due to price hikes forced by the memory chip shortage. Even though Apple's margins for the January-March quarter and its fiscal third-quarter forecast were above Wall Street estimates, outgoing CEO Tim Cook warned that higher memory costs would increasingly weigh on the business from June.