Response to the following problem:
Meyer's Men's Shop Corp. takes a year-end physical inventory at marked selling prices and reduces the total to a cost basis for year-end statement purposes. Meyer's also uses the retail method to estimate the amount of inventory that should be on hand at year-end. By comparing the two totals, it is able to determine inventory shortages. The information at the end of December is as follows:
| 
   
 | 
 At retail 
 | 
 At cost 
 | 
| 
 Sales 
 | 
 $234,680 
 | 
   
 | 
| 
 Sales returns and allowances 
 | 
 3,740 
 | 
   
 | 
| 
 Opening inventory 
 | 
 36,200 
 | 
 $ 24,420 
 | 
| 
 Purchases 
 | 
 239,800 
 | 
 166,770 
 | 
| 
 Purchases returns and allowances 
 | 
 3,900 
 | 
 2,830 
 | 
| 
 Ending inventory 
 | 
 40,900 
 | 
   
 | 
Required:
1. Calculate the estimated ending inventory at cost using the retail inventory method.
2. Calculate the amount of inventory discrepancy at cost.
3. Why might this discrepancy occur?