Calculation of GDP

Q. How many methods are there to calculate GDP in a simple economy?

1. One
2. Two
3. Three
4. Four

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Which type of economy involves only two market participants, viz. producers and consumers?

1. Simple economy
2. Capitalist economy
3. Socialist economy
4. Mixed economy