In macroeconomic theory, total consumption expenditure on goods and services, C, is assumed to be a linear function of national income, L. The table gives the values of C and I for 2004 and 2009 in country A (in billions of dollars). a. Find the formula for C as a function of I. b. The slope of the linear function is called the marginal propensity to consume. What is the marginal propensity to consume for country A from 2004-2009? Year 2004 2009 Total consumption (C) $8,289 $10,086 National income (I) $9,938 $12,027 a. Find the formula for C as a function of I. (Round to four decimal places as needed. Use integers or decimals for any numbers in the expression.)

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