Profit and loss value = (closing price-opening price) × number of purchases× direction of order making-delay fee-handling fee. Buy and sell 5 lots of asphalt on the same day, with the purchase price of 8000 and the selling price of 8 100. His profit and loss are as follows: investment deposit: 8000×10× 5× 4% =16000; Profit and loss: (8100-8000) × 5 ×1×10-(8000+8000) five lots of asphalt 50 products, with a selling price of 4870. On the third day, she closed her position at 4800 yuan. Her profit and loss situation is: investment deposit: 4870×50×5×3% = 36525 Profit and loss situation: (4800-4870)×5×(- 1)×50.