please give answer and comment for each question

a. In the country of Hypothetica, we have the following information for the year 2015: *Consumption totalled $2 billion, but 25% of this total consisted of goods which were initially sold in 2014.~ *A total of $250 million worth of new housing stock was sold.~ *Labour wage income was $150 million.~ *Businesses invested $100 million dollars in new capital (i.e. machinery) stock. *Businesses also bought $200 million dollars' worth of company shares on the stock exchange. *Foreigners with working visas living in foreign-only households bought $100 million worth of locally made goods and services.