Apple has started the new year by disappointing investors with its first profit warning in 17 years. The company said that poor sales of its latest range of iPhones has helped to weaken its first financial quarter (September to December 2018). Apple now expects revenues of US$84 billion (£66 billion) with a gross profit margin of 38%, having initially expected between US$89 billion and US$93 billion. In the same quarter last year, Apple brought in US$88.3 billion on a gross margin of 42%.