Brown Corporation had average days of sales outstanding of 20 days in the most recent fiscal year. Brown wants to improve its credit policies and collection practices and decrease its collection period in the next fiscal year to match the industry average of 16 days. Credit sales in the most recent fiscal year were $480 million, and Brown expects credit sales to increase to $720 million in the next fiscal year. To achieve Brown's goal of decreasing the collection period, what is the change in the average accounts receivable balance that must occur