Answer:
What is Upper Mongoose’s GDP for the year?
GDP = consumption + investment + government expenses + net exports
GDP = $300 billion + $100 billion + $50 billion + $50 billion = $500 billion
What is the size of the underground economy as a percentage of GDP?
underground economy as % of GDP = $75 billion / $500 billion = 0.15 = 15%
By what percentage would GDP be boosted if the value of the services of stay-at-home spouses were included in GDP?
Upper Mongoose's GDP could increase by $25 billion or 5% (= $25 billion / $500 billion) if services performed by stay at home spouses would be included in the GDP