Please I don't know how to prepare a direct materials purchase budget

Bridgeport Industries has adopted the following production budget for the four quarters of 2022 : Each unit requires 4kg of raw materials costing $6 per kilogram. On December 31,2021 , the ending raw materials inventory was 1,800kg. Management wants to have a raw materials inventory at the beginning of each quarter equal to 30% of the current quarter's production requirements. The production budget for the first quarter of 2023 will be 12,100 units. Prepare a direct materials purchases budget by quarters for 2022