Suppose C(x) 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 .



The quantity  is called the marginal propensity to save.



For the consumption function  find the marginal propensity to save. Round the answer to three decimal places, if necessary.



$__________ billion/billion dollars



Fill in the blank(s) with the appropriate word(s).


0.285

Mathematics

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A. ?
B. ?
C. ?
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