Discuss the below:
Q: The manager of a car wash receives pricing schedule (shown below) from the vendor who supplies soap- and a promise of a 25% shorter lead time for deliveries. Currently, lead time is 4 days. Annual usage of soap is 4500 gallons. The car wash is open 360 days a year. Ordering Costs is $ 30 per order and annual holding costs are $ 3 per gallon. Daily usage is normally distributed, the standard deviation of soap 2 gallons.
Quantity Unit Price
1-399 $2.00
400-799 $1.70
800+ $1.62
a. What is the optimal order quantity?
b. What is the reorder point if the acceptable probability of stock-out is 1.5%?
c. What is the total carrying cost at the optimal ordering quantity?