New Delhi, May 26 -- The promoter of Bharti Airtel Ltd will sell shares worth $1 billion in the mobile operator through a block deal on Tuesday, two people said, requesting anonymity. The promoter, Bharti Telecom Ltd, will sell a 2.75% stake in the company at a floor price of Rs.558 per share, the first person said. The floor price is at a discount of around 6% to Bharti Airtel's stock price. p11...