Answer
$\$6.25/\text{h}$
Work Step by Step
There are 160 hours in a month, and since a worker takes one month to clear an acre, they take 160 hours to clear an acre. Additionally, since each acre brings in ${$1000}$ in revenue it means the revenue per hour each worker brings in is:
$\frac{\$1000}{160\text{ h}}=\$6.25/\text{h}$
