Each unit of product Zet requires 3.5 kg of raw material. Next month's budget information for product Zet is as follows. Opening inventories: Raw materials 18 750 kg Finished units of Zet 2 500 units Budgeted sales of Zet 75 000 units Planned closing inventories: Raw materials 8 750 kg Finished units of Zet 3 750 units How many kilograms of raw materials should be purchased next month