Answer:
The maximum size of car payment he can afford is;

Step-by-step explanation:
Given that Oliver makes $54,000 per year.
His monthly income will be;

Also, it was stated that;
debt payments (other than mortgages) should be less than 8% of a consumer's monthly gross income.
8% of Oliver's monthly income will be;

So, Oliver cannot pay more than $360 of debt per month.
Removing the $100 student-loan payment every month.
We have;

Therefore, the maximum size of car payment he can afford is;
