Answer:
only for two months
Explanation:
The company has information about the current ending inventory for this month which will become next month's beginning inventory. Since next month's beginning inventory is equivalent to 25% of next month's total sales needs, it can estimate the sales needs for next month.
With this information, the company can estimate the necessary purchases of direct materials for next month and the estimated ending inventory of direct materials. Using the estimated ending inventory of direct materials as reference, it can estimate the purchases necessary for the following month. But since it doesn't have any more information about the sales needs, it cannot estimate any further direct materials purchases.