Answer:
enough to earn some money but not too much to jeopardize your grades
Step-by-step explanation:
Since your scarce resource is time you need to create a balance between all the tasks, so much so that you are able to benefit from all of the tasks but not substitute one for another. Therefore in this situation, you will work enough to earn some money but not too much to jeopardize your grades. That way you are able to make money to pay for most (if not all) of your expenses but at the same time, you are still making sure you are benefiting from school and not wasting your time in school by not being able to graduate.