Answer:
115 persons
Step-by-step explanation:
The hall charges are as follows:
• Cleanup fee= $60
,
• Cost per person = $34
Let the number of persons invited = n
• The cost for n persons = $34n

Since their budget is $4000, they can spend either less than or equal to $4000. Thus, we have the inequality:

We solve for n:

Oscar and Julie can invite at most 115 persons.
Check

We see that once the number of persons is more than 115, the budget of $4000 is exceeded.