Answer:
The original bill was $192.56
Explanation:
You received a bill for = $72.56
You prepaid on a budget plan for = $120.00 per month
You have already paid $120.00 for the month, but you received a bill of $72.56.
After the payment of $120 you still have to pay $72.56, this means you have to add $72.56 to $120.
Let the original bill be x
x = 120.00 + 72.56
x = 192.56
The original bill was $192.56