Dewitt industries has adopted the following production budget for the first 4 months of 2017. month units month units january 10,430 march 5,130 february 8,210 april 4,470 each unit requires 3 pounds of raw materials costing $3 per pound. on december 31, 2016, the ending raw materials inventory was 9,400 pounds. management wants to have a 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.