Answer:
Ending Inventory = $55,000
Explanation:
<u>Particular                                     Cost price        Retail price
</u>
Opening Inventory                       $30,000       $42,000
<u>Add: Additional Purchases               $196,000       $368,000
</u>
<u>Cost of Goods Available for Sale     $226,000       $410,000
</u>
Cost to Retail Ratio: 55 %  
Less: Net Sales                                                $310,000
Ending Inventory                                $55,000       $100,000 
Note:
Cost to Retail Ratio = $226,000 / $410,000
Cost to Retail Ratio = 55% (Approx)