Question : If MPC is four times MPS and consumption at zero level of income is 50 crore derive the consumption function.
Option 1: C=50+0.2Y
Option 2: C=50+0.8Y
Option 3: C=50-0.2Y
Option 4: C=50-0.8Y
Correct Answer: C=50+0.8Y
Solution : MPC:MPS= 4:1 or
MPC:MPS= 0.8:0.2, since MPC+MPS=1
C=50+0.8Y
Hence, Option B is correct.