Answer: 45 containers 
Step-by-step explanation:
The number of containers needed is calculated by:
= (Expected demand during Lead time + Safety Stock) / Container Capacity 
Expected demand during Lead time = Daily demand * Lead time 
= 2,500 * 3
= 7,500 units 
Safety stock = 1.5 days * 2,500
= 3,750 units
Number of containers needed:
= (7,500 + 3,750) / 250
= 45 containers