Answer:
Note: "The complete and organized question is attached below as picture"
Conventional Inventory Method
Particulars Cost Retail
Beginning inventory A $148,740 $285,000
Purchases $1,359,000 $2,148,000
Markups-net $79,900
Current year's addition B $1,359,000 $2,227,900
Goods available for sale C=A+B) $1,507,740 $2,512,900
Markdown-net ($27,100)
Sales ($2,209,000)
Ending inventory at retail $276,800
Cost-to-retail percentage = $1,507,740 / $2,512,900*100
Cost-to-retail percentage = 0.6 * 100
Cost-to-retail percentage = 60%
Ending inventory at cost = Ending inventory at retail * Cost-to-retail percentage
Ending inventory at cost = $276,800 * 60%
Ending inventory at cost = $166,080