(a) The relationship between annual salary (salary) and the number of previous years of labor market experience (exper) is described by the model:

log() = 10.6 + 0.027

(i) What can you tell about the marginal effect of exper on salary? Provide a sketch of their relationship graphically.

(ii) What can you tell about the marginal effect of exper on log(salary)? Provide a sketch of their relationship graphically.

(iii) What is the approximate percentage increase in salary when exper increases by five years?

(b) It is discovered that the performance of high school graduating students on a standardized test (score) is related to the size of their graduating class (class) measured by the number of students in the class according to: = 45.6 + 0.082 0.0001472 What is the optimal size of the graduating class and the corresponding test score? (Round up to the nearest integer.) What can you tell about the marginal effect of class on score before the optimal class size is reached? Provide a sketch of their relationship graphically