If it is known that the information in a closed economy is as follows: National income = IDR 8 trillion Tax = IDR 1.5 trillion Private savings = IDR 0.5 trillion Public savings = IDR 0.2 trillion 1. Calculate the amount of consumption, government spending, national saving and investment! 2. If private saving becomes IDR 2 trillion, recalculate the amount of consumption, government expenditure, national saving and investment! 3. Explain the impact of changes in private saving on changes in the savings fund market! Complete with a chart to explain the answer.