Please help me to answer the questions no. 18-20. And I would like to have the steps of no.18-20 for better understanding, thanks.

Assuming there is no government or foreign sector, refer to the information provided in figure below to answer next three questions. Aggregate expenditures 200 ($ millions) 50 200 Aggregate output ($ millions) 4 Assignment 1, BECO 1001, 2021-2022, I, Dr. Qiao Zhuo, FBA, University of Macau 18) The equation for the planned aggregate expenditure function AEO is A) AEO = 50 + 0.6Y. B) AEO = 50 + 0.4Y. CHAEO = 80 + 0.6Y. P) AEO = 50 + 0.75Y. 19) A $10 million increase in planned investment changes equilibrium output to A) $225 million. B) $240 million. C) $90 million. D) $175 million 20) A $20 million decrease in autonomous consumption [A) does not affect the MPC. V B) changes equilibrium output to $120 million. C) changes equilibrium expenditure to $120 million. D) all of the above