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Understanding days supply is crucial for inventory management and supply chain efficiency. It helps businesses determine how long current stock will last given the average daily usage. This article presents practice problems focused on real-world days supply scenarios to enhance your analytical skills.
What Is Days Supply?
Days supply refers to the number of days a company’s inventory will last based on current sales or usage rates. It is calculated by dividing the total inventory by the average daily usage.
Understanding this metric helps businesses plan procurement, reduce stockouts, and optimize inventory levels.
Practice Problem 1: Basic Calculation
A pharmacy has 1,200 units of medication in stock. The average daily usage is 30 units. What is the days supply?
- Inventory: 1,200 units
- Daily usage: 30 units
- Days supply = Inventory / Daily usage = 1,200 / 30 = 40 days
Practice Problem 2: Adjusting for Sales Fluctuations
A retailer has 2,500 items in stock. The average daily sales are 50 items, but during the holiday season, sales increase to 80 items per day. How does the days supply change during the holiday?
- Regular days supply = 2,500 / 50 = 50 days
- Holiday days supply = 2,500 / 80 ≈ 31.25 days
Practice Problem 3: Inventory Shortage Scenario
An electronics store has 600 units of a popular gadget. The average daily sales are 20 units. If the store receives a delayed shipment, how many days will the current stock last?
- Inventory: 600 units
- Daily sales: 20 units
- Days supply = 600 / 20 = 30 days
Practice Problem 4: Inventory Replenishment Planning
A manufacturing plant maintains an inventory of 10,000 units of raw materials. The average daily consumption is 250 units. How many days of supply does this inventory represent? If the plant wants to reorder when the supply reaches 2 weeks, what should be the reorder point?
- Days supply = 10,000 / 250 = 40 days
- Reorder point = 2 weeks × 7 days = 14 days of supply
- Reorder quantity = 14 days × 250 units/day = 3,500 units
Practice Problem 5: Complex Scenario
A restaurant stocks 500 pounds of a particular ingredient. The average daily usage is 25 pounds. Due to supplier variability, the usage can fluctuate by ±5 pounds per day. What is the range of days supply considering this variability?
- Minimum usage = 25 – 5 = 20 pounds
- Maximum usage = 25 + 5 = 30 pounds
- Range of days supply = 500 / 30 ≈ 16.67 days to 500 / 20 = 25 days
Conclusion
Practicing days supply calculations in various scenarios enhances your ability to manage inventory effectively. Remember to consider fluctuations and delays that often occur in real-world situations, and adjust your calculations accordingly for better planning and decision-making.