6. The following is a list of figures for a given year in billions of dollars. Using this data, compute: (a) GDP; (b) NDP; (c) NI; (d) Pl; (e) DI; (f) Net exports. Billions of dollars Transfer payments $ 16 Government purchases 80 Personal taxes 38 Corporate income taxes 28 Taxes on production and imports 15 Social Security contributions 8 Undistributed corporate profits 19 Proprietors' income 25 Compensation of employees 258 Personal consumption expenditures 322 Consumption of fixed capital 4 Rents 30 U.S. Exports 14 Corporate profits 70 Interest 35 Dividends 23 Imports to U.S. 17 Gross private domestic investment 63 Net foreign factor income 10 Statistical discrepancy Savings 35 19