What Is the Rate of Saving When Income Equals $300

Multiple Choice

$$\begin{array}{l}\begin{array} { | c | c | } \hline \begin{array} { c } \text { Disposable Income } \\\text { (Billions of dollars per year) }\end{array} & \begin{array} { c } \text { Total Consumption } \\\text { (Billions of dollars per year) }\end{array} \\\hline \$ 0 & \$ 50 \\\hline 200 & 210 \\\hline\end{array}\\\text { Table } 9.1\end{array}$$ What is the rate of saving when income equals $300 billion in Table 9.1?

A) Zero.
B) $50 billion.
C) $10 billion.
D) -$290 billion.