Final answer:
The net change to Ian's account will be a credit of $22.50 after the utility company credits five transactions of $4.50 each.
Step-by-step explanation:
The utility company has agreed to credit Ian's account for five transactions, each worth $4.50. To find the total credit Ian will receive, we need to multiply the amount of each transaction by the number of transactions:
5 transactions × $4.50 per transaction = $22.50
So, the net change to Ian's account will be a credit of $22.50. This amount will be credited to his electric bill, reducing the balance owed or potentially resulting in a credit balance to apply to future bills.