4. Given the following data about the economy: Profit $ 268 Consumption 700 Investment 500 Government spending 300 Net exports 275 Rent 25 Depreciation 25 Net foreign factor income 3 Interest 150 Compensation to employees 1,329 a. Calculate aggregate output (GDP) and aggregate income (gross domestic income) b. Compare the two calculations from part (a). Why are they not precisely equal? c. Calculate national income (also known as net domestic product, NDP). d. Calculate gross national product (GNP)