n 2.5 Homework Question 19, 2.5.67 HW Score: 85%, 17 of 20 points Part 1 of 2 X Points: 0 of 1 K In macroeconomic theory, total consumption expenditure on goods Year 2004 2009 and services, C, is assumed to be a linear Total consumption (C) $8,286 $10,090 function of national income, I. The table gives the values of C and I for 2004 and National income (1) $9,933 $12,026 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? a. Find the formula for C as a function of 1. C= (Round to four decimal places as needed. Use integers or decimals for any numbers in the expression.)