Assume that you had estimated the following quadratic regression model Life Expectancy = 50 + 0.35 Income - 0.001 Income 2 , where Income is a variable that measures per capita income in $10,000. If income increased from 40 to 41 ($40,000 to $41,000), then the predicted effect on life expectancy would be: a. 0.269 b. 0.349 c. 0.0035 d. Cannot be calculated with the information provided