The following table provides data on elementary and secondary school enrollment and the number of classroom teachers for each of five years in the United States.
Year Enrollment Classroom teacher
1960 42181 1600
1965 48473 1933
1970 51272 2288
1975 49791 2451
1980 45949 2439
a. Plot the five points on the total product curve where the variable input is classroom teachers and the output is enrollment.
b. Find the point at which the total product is maximum.
c. Plot the average and marginal product for classroom teachers.