gdp is first calculated, and then depreciation of capital is subtracted from it to get national income. b. national income is first calculated, and then depreciation of capital and indirect business taxes are subtracted from it to get gdp. c. gdp is first calculated, and then gross private domestic investment is subtracted from it to get national income. d. gdp is first calculated, and then capital depreciation and proprietors' income are subtracted from it to get national income.