Finance ministers from the world's wealthiest nations have agreed to a historic accord to cancel up to $55 billion worth of debt owed by the world's poorest nations. The Group of Eight (G8) ministers -- meeting for a second day Saturday in London -- backed a deal that calls for an immediate scrapping of 100 percent of the debt owed by 18 countries. Those countries -- many in sub-Saharan Africa -- owe about $40 billion to the World Bank, the International Monetary Fund and the African Development Bank. The G8 ministers also said 20 other countries could be eligible for debt relief if they meet targets for good governance and tackling corruption -- bringing the total package to more than $55 billion. --MORE 1155 Local Time 0855 GMT