Answer:
The rate a tutor charges per hour is a proportional relationship as the cost to time ratio is constant. In this case, the tutor charges a constant rate of $30 per hour.
Step-by-step explanation:
In the scenario stated, the tutor is indeed charging in a proportional manner. In mathematics, a relationship is considered proportional if it maintains a constant rate or ratio. Here, the ratio of the cost to the time (hours) is constant. For example, if he tutors for 1 hour, he will get $30. If he tutors for 3 hours, he'll get 3 times $30, which is $90. Hence, the ratio is constantly $30/hour, making it proportional.