1.

You just bought one XYZ August 50 call option contract for a premium of $4 per share. Assume the current stock price of XYZ is $51 and that you hold the option until the expiration date when ABC stock sells for $52 per share. What is the rate of return of your investment?

那个50 call option其实指的是什么  $4又是什么 rate of return又是怎么算

2.

The current stock price of ABC is $50 and you just bought one ABC August 45 put option contract for a premium of $2 per share. Assume you hold the option until the expiration date and the stock price of ABC sells for $48 on that date. What is the rate of return of your investment?

同上  45 put option何解 ...

1.50% 2.-100%