Suppose in a closed economy, its national income or GDP (Y) and government spending (G) is fixed in a given year. Marginal propensity to consume (MPC) is 0.75. Now the government raises taxes (T) by $100 billion. What would happen to the following? Do they rise or fall? By how much?Note: Y and G are constant in this question.

a. Public saving ___?

b. Private saving ___?

c. National saving ___?

d. Investment ___?