I need to solve the following questions all using the Weighted Average method, for process costing

Use the following information for the next 5 questions. Hendrix, Inc. employs a process costing system. Here is information about July's activities:Direct materials are added at the beginning of the process. On July 1: Beginning inventories =750 units, 60% complete Direct materials cost =$5,925 Conversion costs =$4,095 During July: 15,000 units started Direct materials added =$150,000 Conversion costs added =$83,520 On July 31: Ending inventories =1,500 units, 40% complete 4. Using the weighted average method, the number of equivalent units of material (equivalent units of production in terms of material cost) was a. 15,750 b. 14,250 c. 15,000 d. 13,500