Can somebody please help with this multiple choice question?? (1 Viewer)

[hayhay2012]

http://www4.boardofstudies.nsw.edu....wer=B&courseID=15110&testQuestionID=287847306
What are the steps to calculating this type of question?

Thanks in advance!

 

[OzKo]

Y=C+I+G+(X-M)

In this particular case, only consumption and investment are present.

Y=100+0.8Y+40
Y=140+0.8Y
0.2Y=140
Y=700