A company uses a process cost accounting system and the Weighted Average inventory valuation method. Its Assembly Department's beginning inventory consisted of 50,000 units, 3/4 complete with respect to direct labor and overhead. The department started and finished 127,500 units this period. The ending inventory consists of 40,000 units that are 1/4 complete with respect to direct labor and overhead. All direct materials are added at the beginning of the process. Goods in Process included direct labor costs of $30,000 and overhead costs of $40,000 for the period. The Overhead cost per equivalent unit is: