Concept:Net National Product (NNP) is calculated by subtracting depreciation from Gross National Product (GNP).Explanation:From the table, Gross National Product is $400m.Depreciation is $100m.Use the formula:NNP=GNP−DepreciationNNP=$400m−$100mNNP=$300mAnswer:Net National Product = $300m.Correct option: C. $300m.