By Vivek Kumar Apple’s stock surged by over 6 per cent in after-hours trading on Thursday after the tech giant surpassed analysts’ subdued expectations for quarterly revenue and announced the largest share buyback program in US history. While the tech giant reported a 4 per cent revenue decline to $90.75 billion compared to the previous year, it managed to slightly beat the consensus estimate of $90.3 billion. Earnings per share also came in higher than expected at $1.53, surpassing the $1.50 estimate. What’s more, Apple made a splash by announcing a massive $110 billion share buyback, the lar…