Explanation:
Ok so lets begin with what we know. Each guest is $20.50, 144 guests arrived, and they started with $2,500.
The equation would be 2,500-20.5(144)
20.5(144)=$2,952
Now the issue here is that the payment is more than the account balance and so im guessing either they want the answer as $0, they want the negative value which is -$452, or there was another part before this with the old account info.