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Suppose C(x] measures an economy's personal consumption expenditure arid X the personal income, both in billions of dollars. Therl the following function measures the economy's savings corresponding to an income of x billion dollars. Six) = x - C(X) (income minus consumption) The quantity E below is called the marginalpropensity to save. o'x d5 _ 1 _ dc dx dx For the following consumption function, find the marginal propensity to save when x = I1. {Round your answer to three decimal places.) C(X)=I:I.892X1'L + 28.9 $ |:| billion per billion dollars