How do you solve this question with specific steps?

GEN. an increase in government spending of $100 billion increases equilibrium output by a total of $500 billing then the marginal propensity to consume must be at least A. 0.20 MPC = 400 B. 0.50 C. 0.75 400 = 0,8 D 0.80 E. 0.90 500 licy output and