Fill in the missing cells in the table to calculate GDP using the expenditure approach. Data (Billions of dollars) Consumption (C) 13,948.5 Investment (I) 3,650.1 Exports (X) 2,531.3 Imports (M) 3,156.7 Net Exports of Goods and Services Government Purchases (G) 3,520.8 Gross Domestic Product (GDP)