With a net worth of aboutUS $80 billion, Mukesh Ambani is again richer than Zhong Shanshan, whose bottled-water company tanked a record 20% this week. The Chinese tycoon is worth US$76.6 billion, down more than $22 billion from a peak just last week, according to the Bloomberg Billionaires Index. - Reuters SINGAPORE, Feb 28 (Bloomberg): India’s Mukesh Ambani is back to being the wealthiest person in Asia. Despite a brutal week for markets, his Reliance Industries Ltd. was relatively unscathed as it said it would spin off its oil-to-chemicals business into an independent unit. With a net worth of aboutUS $80 billion, Ambani is again richer than Zhong Shanshan, whose bottled-water company tanked a record 20% this week. The Chinese tycoon is worth US$76.6 billion, down more than $22 billion from a peak just last week, according to the Bloomberg Billionaires Index.