The following table provides data on elementary and secondary school enrollment and the number of classroom teachers for each of five years in the U.S.

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.

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1960 1965 1970 1975 1980 Enrollment (thousands) Classroom Teachers (thousands) 42,181 48,473 51,272 49,79145,949 1,600 1,933 2,2882,451 2,439