a) Sandy Island's 2019 GDP is $1,200 billion.
b) The value of the net exports is -$200 billion ($300 - $500 billion).
Data and Calculations:
Personal Consumption Expenditure = $900 billions
Government Expenditure = $300 billion
Net Indirect Taxes = $350 billion
Investment Expenditure = $200 billion
Exports of goods and services = $300 billion
Imports of goods and services = $500 billion
Depreciation = $100 billion
In Economics, Sandy Island's 2019 GDP is defined by the following formula: GDP = C + I + G + NX
Where GDP = Gross Domestic Product
C = Personal Consumption Expenditures
I = Investment (business expenditures and home purchases by households)
G = Government Expenditure or Spending
NX = Exports - Imports
Thus, Sandy Island's 2019 GDP = $1,200 ($900 + $200 + $300 + $300 - $500) billion.
Learn more: calculating a nation's GDP here: https://brainly.com/question/1384502
