To calculate the average product of labor when 3 workers are employed, we first need to determine the total production output (cars washed). From the given production data, we know that with 3 employees working, they wash a total of 42 cars a day.
The average product of labor can be calculated by dividing the total production output by the number of workers employed. So, the average product of labor with 3 workers is:
42 cars washed / 3 workers = 14 cars per worker
Therefore, the average product of labor when you have employed 3 workers is 14 cars per worker.