Suppose a909 is 345 1 yuan a ton. So if the futures contract is 10 ton, you need to pay 345 1 * 10 ton = 345 10 yuan, and the deposit you need to pay (calculated by 15%) is 345108 *.

The minimum variable price means that the minimum price change is 1 yuan, for example, from 345 1 to 3452, and there is no concept of 345 1.5.