Barclays' South Africa unit Absa H1 profit up 8 pct as bad debts fall
* Impairments down by 14 pct * Declares special dividend of 708 cents JOHANNESBURG, July 30 (Reuters) - Absa Group, the South African bank majority owned by Britain's Barclays Plc , posted an 8 percent rise in half-year earnings on Tuesday after its bad loans shrunk. Headline ea
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