Answer: The marginal product of the first worker is 4 yards per day.
Explanation:
The marginal product of labor is the level of output that is produced by an additional labor that is added.
Marginal product of the nth labor = total product of nth labor - total product of (n-1)th labor
Hence,
Marginal Product of first worker = Total product of first worker - total product of zero worker
= 4 - 0
= 4
∴The marginal product of the first worker is 4 yards per day.