The chart below gives the data necessary to make a Keynesian cross diagram. Assume that the tax rate is $0\mathrm{.}4$ of national income, the MPC out of after$-$tax income is $0\mathrm{.}9,$ investment is $58,$ government spending is $60,$ exports are $40,$ and imports are $0\mathrm{.}1$ of after$-$tax income.

$\backslash$table$[[\backslash$table$[[$National$],[$Income$]],\backslash$table$[[$After$-$tax$],[$income$]],$Consumption,$1+G+x,\backslash$table$[[$Minus$],[$Imports$]],\backslash$table$[[$Aggregate$],[$Expenditures$]]],[100,,104,,,],[200,,,,,],[300,,,,,],[400,,,,,],[500,,,,,],[600,,,,,]]$

Alt Text: This chart contains the following columns: National Income, After$-$tax income, Consumption, I$+$G$+$X$,$ Minus Imports, and Aggregate Expenditures. The National Income Column contains the following values for each of the following rows: $100,200,300,400,500,$ and $600.$ The only other value provided is the consumption, $104,$ for national income, $100.$

What is the equilibrium level of national income for this economy?

$Y=400$

$Y=500$

$Y=200$

$Y=300$