Tech giant Apple registered a double-digit rise in iPhone sales in India, and witnessed strong demand for iPads in the December-quarter. The Cupertino-based company posted its highest-ever quarterly revenue at USD 91.8-billion, an increase of 9 per cent from the year-ago quarter. Its net profit also hit an all-time high of USD 22-billion. International sales accounted for 61 per cent of the quarter's revenue.