Zimbabwe's opposition leader Morgan Tsvangirai is to be sworn in as prime minister in a unity government with President Robert Mugabe. Mr Tsvangirai won the first round of last year's presidential election - but he withdrew from the run-off citing violence against his supporters. However he later agreed to share power with Mr Mugabe. Problems facing the new government include a cholera epidemic, a collapsed economy and a 90% unemployment rate. More than 3,400 people have died in Zimbabwe's cholera epidemic, and the country's annual inflation was last estimated at 231m%. More than half the population rely on emergency food aid. New coalition Earlier, Mr Tsvangirai named Tendai Biti, the secretary general of his Movement for Democratic Change (MDC), as his choice for finance minister. A Zimbabwean judge last week dropped treason charges against Mr Biti over an alleged coup plot, citing lack of progress in the case against him. Mr Biti's new position will be a key one, given the country's economic collapse. In January, Mr Tsvangirai returned to Zimbabwe after an absence of more than two months for fresh talks with Mr Mugabe on sharing power. Earlier negotiations had faltered after the MDC accused Mr Mugabe's Zanu-PF of keeping the most powerful ministries - including the one that controls the police - to itself. The cabinet in the new coalition government will be sworn in on Friday. Source: BBC