Answer:
The correct answer is option C. Increase both government spending and taxes by exist300 billion.
Explanation:
Expenditure multiplier = 1 / (1 - MPC) = 5
Tax multiplier = - MPC / (1 - MPC) = -4
Change in multiplier = (300*5) +(-4*300)
= 1500 - 1200
= 300 billion
Therefore,there should be increase in both government spending and taxes by exist 300 billion.