math
posted by Smantha .
Suppose C(x) measures an economy's personal consumption expenditure and x the personal income, both in billions of dollars. Then the following function measures the economy's savings corresponding to an income of x billion dollars.
S(x) = x  C(x) (Income minus consumption)
The quantity dS/dx below is called the marginal propensity to save.
For the following consumption function, find the marginal propensity to save.
C(x) = 0.701x + 99.34
$ billion per billion dollars
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