Stock markets rebound as GST revenues hit record in AprilFrom the Sensex basket, Power Grid, Asian Paints, Tata Motors, Tata Steel, NTPC, Sun Pharma, Mahindra & Mahindra, HDFC Bank, Tata Consultancy Services and JSW Steel were among the major gainers. Kotak Mahindra Bank, Bharti Airtel, Axis...