$\"\"$

Rate of change = $\"\"$ .

The wage changes from 36$ to 0$ and the time changes from 3h to 0 hours.

Rate of change = $\"\"$

Rate of change = $\"\"$ . (Divide: $\"\"$ )

So, the rate of change is $\"\"$ , or a increase of $\"\"$ per one hour. $\"\"$

The rate of change is $\"\"$ .