Answer:
The answer is "The third worker".
Explanation:
Please find the correct question in the attachment file.
[tex]\text{Number of Workers}[/tex] [tex]\ Units \ of \ Out-put[/tex] [tex]\text{marginal Product}\\\\[/tex] [tex]1\ \ \ \ \ \ \ \ \ \ \ \ \ \ 40\ \ \ \ \ \ \ \ \ \ \ \ \ \ 40 \\\\2 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 90 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 50\\\\ 3 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 126 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 36\\\\ 4 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 150\ \ \ \ \ \ \ \ \ \ \ \ \ \ 24\\\\ 5 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 165 \ \ \ \ \ \ \ \ \ \ \ \ \ \ 15\\\\ 6\ \ \ \ \ \ \ \ \ \ \ \ \ \ 180\ \ \ \ \ \ \ \ \ \ \ \ \ \ 15[/tex]
from 50 units down to 36 units.