To be profitable, though, at expiration, the stock must be trading for more than 58, the total of the option premium (8 1/2) and the strike price of 50.
2
期权买方需要支付溢价购买时的选择，这是非常远低于股票的价格。
Option buyer need to pay a premium when buying options, which is very much less than the stock prices.
3
如果在3个月内平均的风险溢价上升超过了执行价，期权的收益可以抵消高出来的利息支付。
If the average risk premium rises above the strike rate in three months, the higher interest payments will be offset by gains from the option.
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