Please help this thing confused me alot

In a small, closed economy, national income (gdp) is $350 million for the current year. individuals have spent $100 million on the consumption of goods and services. they have paid a total of $60 million in taxes and the government has spent $75 million on goods and services this year. use this information and the national income identity to answer the questions. how much does the economy spend on investment?

Why is it necessary to obey social norms? write briefly.

Acharacterized by intimate, long-term, face-to-face association and cooperation. primary group community clique secondary group