Answer: 
- Materials ⇒ 90,000 units 
- Conversion ⇒ 84,000 units 
Step-by-step explanation:
Materials 
Material is added at the beginning of production which means that it is complete at period end. 
Equivalent unit of production for Materials:
= Units started and completed + Units in ending WIP
= 75,000 + 15,000
= 90,000 units 
Conversion
Ending WIP is only 60% complete conversion wise. 
Equivalent unit is therefore:
= Units started and completed + Units in ending WIP 
= 75,000 + (15,000 * 60%)
= 84,000 units