Answer:
William and Debra pierce can invite 140 people for the 20th anniversary.
Step-by-step explanation:
Total budget = 4500 $
Charge of cleanup = 60$
Remaining money = 4500 - 60 = 4440 $
Charge per person = 30 $
Number of persons they can invite
So William and Debra pierce can invite 140 people for the 20th anniversary.