Answer:
22000 units
Step-by-step explanation:
The movement in the balance of supplies at the start and end of a period is as a result of usage and purchases. While usage reduces the balance in supplies, purchases increase the balance. This may be expressed mathematically as
Opening balance + purchases/production - units used/sold = closing balance
Considering the equation above,
5000 + production -23000 = 4000
Production = 4000 + 23000 - 5000
= 22000 units