Cost of Units Completed and in Process The charges to Work in Process-Assembly Department for a period, together with information concerning production, are as follows. All direct materials are placed in process at the beginning of production. a. Based on the above data, determine the different costs listed below. If required, round your interim calculations to two decimal places. b. Did the production costs change from the preceding period? c. Assuming that the direct materials cost per unit did not change from the preceding period, did the conversion costs per equivalent unit increase, decrease, or remain the same for the current period