When Disposable Income Equals $800 Billion, Planned Consumption Expenditure Equals

When disposable income equals $800 billion, planned consumption expenditure equals $600 billion, and when disposable income equals $1,000 billion, planned consumption expenditure equals $640 billion. What is planned saving when disposable income is $800 billion?

A) $1,400 billion
B) $200 billion
C) $360 billion
D) $560 billion