GCE Economics 1990 Theory question 107

National income is the total money value of all final goods and services produced in a country in a year, plus net income from abroad.
Uses:
1. Measures economic growth over time.
2. Gives per capita income and indicates standard of living.
3. Helps economic planning and policy making.
4. Shows the contribution of each sector.
5. Allows comparison with other countries.
6. Shows distribution of income; guides taxation.
7. Guides investors.
8. Used by international bodies for aid, loans and contributions.

Give a precise definition first.