suppose in the year 2019, people spent $100 on durable goods, $200 on non-durable goods, and $700 on services. during the same year, the government paid a combined total of $300 to soldiers and police officers, spent $200 building missiles and highways, spent $400 total on welfare and unemployment benefits and $100 on social security payments. during this year the united states had imports totaling up to $500 while exporting $200 worth of goods and services. finally, firms spent $100 on machines that will increase their productive capacity and they raised the amount of goods in their inventories from $300 at the beginning of the year to $500 at the end of the year. please use this information to calculate total gdp for 2019