Answer
$\$1,000$ (per month / per worker).
Work Step by Step
1 worker clears 1 acre/month → revenue = $\$1,000$/acre.
Equipment rental cost to employer = $\$150$ per worker per month.
Work time = $40$ hours/week × $4$ weeks $= 160$ hours/month.
Marginal revenue product (MRP) of one worker for one month
MRP = value of the extra output produced = $\$1,000$ (per month / per worker).