For example, at present, the spot silver is 6360 RMB per kilogram, and the first hand 15 kg requires 8% deposit, so the first hand needs 6360* 15*8%=7632 RMB, and the fluctuation point is 15 RMB. If you earn a lot in the first hand, you need 100 points. That is, 15 * 100 =1500 yuan, and the handling fee is (6360+6460) * 8% *15 =153.84, with a difference of10. 10= 150 RMB for first-hand profit, that is,150-153.84-150 =196.1. This is just a formula. I hope it helps you.