Ok, Let's say I short a stock at the last close on Friday and get that price, $288.50. And I simultaneously sold a one week OTM put at a 287.50 and bought a one week ITM call at 287.50 for a combined premium credit of $450.
Now if the stock closes below the 287.50 strike, I get an extra $100, right, as the short put when it expires it will take away (sell) my short stock at $287.50.
And if the strike closes above the strike, my long call kicks, in and the short is bought back for a gain of $100.
Thus my gain here is $550, no matter what the stock does.
Can this possibly be right? If not, where have I gone wrong?