Select all that apply Which of the following are true of process costing? Multiple select question. Weighted-average costing adds the costs together first and then divides this total cost by the total work for the two periods. Weighted-average costing keeps the costs and the work separate and, in effect, computes separate unit costs for the two periods. FIFO costing keeps the costs and the work separate and, in effect, computes separate unit costs for the two periods. FIFO costing adds the costs together first and then divides this total cost by the total work for the two periods