Complete the Accompanying Table and Answer the Question Based on \begin{array}{c}
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Multiple Choice

$\begin{array}{|c|c|c|c|c|c|}\hline\begin{array}{c}\text { Domestic Output } \\(G D P=D I) \end{array} & \begin{array}{c}\text { Aggregate } \\\text { Expenditures, } \\\text { Closed Economy }\end{array} & \text { Exports } & \text { Imports } & \text { Net Exports } & \begin{array}{c}\text { Aggregate } \\\text { Expenditures, Open } \\\text { Economy }\end{array} \\\hline \$ 200 & \$ 230 & \$ 30 & \$ 20 & \$- &\$- \\\hline 250 & 270 & 30 & 20 & -&- \\\hline 300 & 310 & 30 & 20 & -& - \\\hline 350 & 350 & 30 & 20 & -& - \\\hline 400 & 390 & 30 & 20 & -& - \\\hline 450 & 430 & 30 & 20 & -& - \\\hline 500 & 470 & 30 & 20 & -& - \\\hline\end{array}$ Complete the accompanying table and answer the question based on the resulting data. All ?gures are in billions of dollars. For the open economy, the equilibrium GDP and the multiplier are

A) $300 and 2.5.
B) $450 and 5.
C) $400 and 4.
D) $400 and 5.