Calculate Marginal Propensity to Save (MPS) and Average Propensity to Consume (APC) at income level of 200.

The correct option is:

MPS = 0.5; APC = 0.75

Calculation:

At the income level of $Y = 200$ (where consumption $C = 150$ and previous income $Y_0 = 100$, previous consumption $C_0 = 100$):

1. Average Propensity to Consume (APC):

$APC = \frac{C}{Y} = \frac{150}{200} = \mathbf{0.75}$

2. Marginal Propensity to Save (MPS):

$\Delta Y = 200 - 100 = 100$

$\Delta C = 150 - 100 = 50$

$MPC = \frac{\Delta C}{\Delta Y} = \frac{50}{100} = 0.5$

$MPS = 1 - MPC = 1 - 0.5 = \mathbf{0.5}$