Since the party hall offers $50 per person
Since there are 50 people, then
The party hall cost is

Since the hall rental offers $1150 and $27.50 per person
Since there are 50 people, then
Multiply 27.5 by 50 and add 1150 to the product to find the total cost

The correct answer is
The party hall's meal option costs $2500, the hall-only rental and external caterer option costs $2525. The party hall's meal option is cheaper
Option D