The investor deposited 30 thousand yuan in his account for futures trading. The next day, he sold 10 lots of wheat futures contracts (each lot 10 tons) at a price of 2800 yuan/ton. Assuming that the margin ratio is 10%, is it necessary to add margin for wheat falling by 2600 yuan/ton?

Answer: After selling the futures contract, the futures price falls, which means making money. Naturally, there is no need to add a deposit.

If it rises to 3000 yuan/ton in the later period, do you want to add a deposit? If so, how much should I add? Can you list the formulas?

A: The first loss is: (3,000-2,800) yuan × 10 lot × 10 ton = 20,000 yuan.

Residual deposit: 30,000-20,000 yuan = 1 10,000 yuan.

Required deposit: 3000 yuan × 10 ton × 10 lot × 10%=30000 yuan.

Additional deposit: 30,000-1 10,000 = 20,000 yuan.

(The above fees are not calculated)