find NDP at Factor cost from the following data:
i. gross domestic fixed investment . 10,000
ii. inventory invetment 5,000
iii. depreciation 2,000
iv. indirect taxes 1,000
v. Subsidies 2,000
vi. consumption expenditure 20,000
vii. residential consumption expenditure 6,000
why isnt residential consumption expenditure included in calculating NDP?