Answer:
Increase by more than $500 billion.
Step-by-step explanation:
Use the below formula to find the multiplier effect.
Multiplier = 1 / (1-MPC)
Multiplier = 1 / (1 - 0.8)
Multiplier = 1 / 0.2
Mulitiplier = 5
GDP increase by = 5 x 100
GDP increases by = $500
Since the multiplier is five and the increase in transfer by $100 that will have multiplier effect of $500. Thus option "a" is correct.