Complete the Following Table and Answer the Question on the Basis

Complete the following table and answer the question on the basis of the resulting data.All figures are in billions of dollars. $\begin{array}{cccccc}\begin{array}{c}\text { Domestic } \\\text { Output } \\\underline{\text { (GDP = DI) }}\end{array} & \begin{array}{c}\text { Aggregate } \\\text { Expenditures, } \\\underline{\text { Closed Economy }}\end{array} & \begin{array}{c}\\\\\underline{\text { Exports }}\end{array} & \begin{array}{c}\\\\\underline{\text { Imports }}\end{array} & \begin{array}{c}\\\text { Net } \\\underline{\text { Exports }}\end{array} & \begin{array}{c}\text { Aggregate } \\\text { Expenditures, } \\\underline{\text { Open Economy }}\end{array} \\ \$ 200 & \$ 230 & \$ 30 & \$ 20 & \$- & \$- \\250 & 270 & 30 & 20 & -&- \\300 & 310 & 30 & 20 & - & - \\350 & 350 & 30 & 20 & - & - \\400 & 390 & 30 & 20 & - & - \\450 & 430 & 30 & 20 & - & - \\500 & 470 & 30 & 20 & - & -\end{array}$ Refer to the table.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.