Final answer:
The buyer's debit and seller's credit for a prorated June utility bill of $140 for nine days would both be $42 when rounded to the nearest whole dollar.
Step-by-step explanation:
If a buyer owes a seller for a June utility bill of $140, prorated for nine days, we need to first determine the daily rate for the utility bill and then multiply this by the number of days the buyer is responsible for. To get the daily rate, we would divide the total monthly amount by the number of days in June. June typically has 30 days, so the daily rate for the utility bill is $140 divided by 30, which is approximately $4.67 per day. Multiplying the daily rate by the nine days of usage, the buyer would owe $4.67 * 9, which is $42.03. When rounded to the nearest whole dollar, the buyer's debit and the seller's credit would both be $42.