In the table below, you are given data for the country of Spruce. Net foreign factor income -23 Gross mixed income 128 Depreciation 158 Compensation of Employees 470 Indirect taxes (net of subsidies) 103 Gross operating surplus 267 Taxes less subsidies on production 44 a. The value of GDI (at market prices) is $ 924 b. The value of NDI (at basic prices) is $ c. The value of (net) national income is $