Suppose  measures an economy's personal consumption expenditure and x the personal income, both in billions of dollars. Then,   measures the economy's savings corresponding to an income of x billion dollars. Then 

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The quantity dS/dx is called the marginal propensity to save.



For the consumption function , find the marginal propensity to save.





A. $0.43 billion/billion dollars

B. $0.286 billion/billion dollars

C. $0.68 billion/billion dollars

D. $0.337 billion/billion dollars


Answer: B

Mathematics

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