Exercise 21-5 DeWitt Industries has adopted the following production budget for the first 4 months of 2017 Month January February Each unit requires 3 pounds of raw materials costing $2 per pound. On December 31, 2016, the ending raw materials inventory was 9,130 pounds. Management wants to have a Units Month Units 10,230 March 5,410 4,500 8,150 April raw materials inventory at the end of the month equal to 20% of next month's production requirements Prepare a direct materials purchases budget by month for the first quarter