Answer:
The answer is "200".
Explanation:
Let:
[tex]Labour \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Total Labour Product }\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{The marginal Labour Product}\\\\[/tex]
[tex]12\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (12\times20)=240 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -\\\\22\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (22\times20)=440 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 440-240 = 200\\\\30 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (30\times20)=600 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 600-440 = 160\\\\[/tex]
In the above-given table 12,22, and 30 values are multiplied by 20 since each client is paid $20 per driveway change, that's why it indicates that the second worker's marginal product is the (200).