To find the equilibrium level of income, we can use the following formula from the Keynesian expenditure approach:
\[ Y = C + I \]
Where:
- \( Y \) is the equilibrium level of income,
- \( C \) is total consumption, and
- \( I \) is investment.
Consumption \( C \) can be expressed as:
\[ C = C_0 + MPC \times Y \]
Where:
- \( C_0 \) is autonomous consumption (given as R110 million),
- \( MPC \) is the marginal propensity to consume (given as 0.8).
Substituting the known values into the consumption equation, we get:
\[ C = 110 + 0.8Y \]
Now we can substitute the consumption equation into the equilibrium income equation:
\[ Y = (110 + 0.8Y) + 150 \]
Now simplify it:
\[ Y = 260 + 0.8Y \]
Next, isolate \( Y \):
\[ Y - 0.8Y = 260 \]
\[ 0.2Y = 260 \]
\[ Y = \frac{260}{0.2} \]
\[ Y = 1300 \]
So, the equilibrium level of income is R1,300 million.