Why does the world bank charge little or no interest on the loans it makes?

Why does the World Bank charge little or no interest on the loans it makes? The World Bank focuses on development, not making a profit. The World Bank is an international financial institute that will give loans to countries around the world for working on capital projects. Since the World Bank wants to help different countries grow, if they were to charge an excessive amount of interest that would be rather hard for countries to afford. 

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