If real GDP is $30 trillion, calculate disposable income, consumption expenditure, and aggregate planned expenditure. What is equilibrium expenditure?

In an economy with no exports and no imports, autonomous consumption is $1 trillion, the marginal propensity to consume is 0.8, investment is $5 trillion, and government expenditure on goods and services is $4 trillion. Taxes are $4 trillion and do not vary with real GDP.