We have the following data for a hypothetical closed economy: GNP = $9,000 Consumption (C) = $7,800 Government Purchases (G) = $1,400 Tax Collections (T) = $1,600 Part 2 What is the value of private savings SP? $negative 400400. (Enter your answer as an integer. Include a minus sign if necessary.) Part 3 What is the value of government savings Sg? $200200. (Enter your answer as an integer. Include a minus sign if necessary.) Part 4 In this closed economy, what must be the value of investment expenditure? $enter your response here. (Enter your answer as an integer. Include a minus sign if necessary.)