The total value of production generated by the resources that belongs only to the citizens of a country is called national output or national product. What's important is whether the production was done by a local or a foreigner.
National Product = Domestic Production-Net Foreign Factor Income(Foreign receipts-Payment to foreign factors)
There are 2 methods to calculate national income, 1)Calculating national Income from production method. 2)Calculating national income from income method.
National income of a country depends on national product. National product is the factor which generates national income. In other words, Net National Product(@ Factor Cost)=National Income.