That is, when breakeven, market price = execution price-royalty.
For example, the put option contract price (strike price 10 yuan), the option fee 2 yuan, and after a period of time, the spot price 8 yuan.
Since the spot price has fallen, the contract should be executed (I will fall if I buy it), whether it is a loss or not. The formula for calculating profit and loss should be: strike price-spot price-option fee.