In: Operations Management
A clothing retailer is selling a fashion print tee that retails for $22.95 and has a total landed cost of $15.35 per unit. A new print is released each month, and any leftover inventory from the previous month is deeply discounted to $6.95 to clear space for new product. Assume that all units sell at the clearance price.
Based on sales in previous months, you've determined that full-price demand for each fashion tee is normally distributed with mean 1,380 and standard deviation 478. You expect demand this month to follow the same distribution.
Calculate the optimal order quantity using the newsvendor model. Round your answer to the nearest integer.
Suppose you had ordered the quantity from the previous question in each month of 2018. Actual demand values in each month are shown in the table below, and in the attached Excel file. Calculate total profit for the year by calculating and summing the profit in each month. On the revenue side, be sure to include both full-price and clearance-price sales. On the cost side, assume that the total landed cost per unit is the only relevant cost for this calculation.
Month | Demand |
January | 1130 |
February | 2151 |
March | 1342 |
April | 1700 |
May | 993 |
June | 663 |
July | 1204 |
August | 677 |
September | 1776 |
October | 1980 |
November | 1593 |
December | 1351 |
Cost of Underage Cu = Price - Cost = 22.95 - 15.35 = 7.60
Cost of overage Co = Cost - Salvage Value = 15.35 - 6.95 = 8.40
Service Level = Cu/(Co+Cu)
Service Level = 7.60/(7.60+8.40) = 0.475
Corresponding z value = -0.06271
Q = Mean + z*SD
Q = 1380 + (-0.06271*478)
Q = 1350.025
Q = 1350 unit
Below is the calculation of profit -
Month | January | February | March | April | May | June | July | August | September | October | November | December |
Demand | 1130 | 2151 | 1342 | 1700 | 993 | 663 | 1204 | 677 | 1776 | 1980 | 1593 | 1351 |
Q | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 | 1350 |
Profit | 8588 | 10260 | 10199.2 | 10260 | 7546.8 | 5038.8 | 9150.4 | 5145.2 | 10260 | 10260 | 10260 | 10260 |
Loss on leftover | 0 | 6728.4 | 0 | 2940 | 0 | 0 | 0 | 0 | 3578.4 | 5292 | 2041.2 | 8.4 |
Final Profit | 8588 | 3531.6 | 10199.2 | 7320 | 7546.8 | 5038.8 | 9150.4 | 5145.2 | 6681.6 | 4968 | 8218.8 | 10251.6 |
Total Profit | 86640 |
Below is the screenshot of the formula applied to get the result -