So some basic calculations:
If in 20 days the stock should fall to $250: then
Calls = $21.54 = $4,308 [loss of $5,866]
Stock x 120 x $100 = $12,000
Profit = $6,134
At which point you could [obviously] close the trade.
If in 20 days price went to $450: then
Calls = $150 = $30,000
Stock = 120 x 100 = [-12,000]
Profit = $18,000
Again, you could close the trade.
The paying of time premium, is to allow the trade time to work if it just doesn't move that $100 in 20 days.
The second issue of course is: it trades to $50 up/down. What do you do? Let it run, it reverses, or, adjust and the stock continues to run. Can be frustrating. Less frustrating than stocks triggering stops, closing the trade and then reversing though.
Helps a lot if you can [reasonably accurately] pick major turning points. Now you can rake in profits.
Prices are theoretical prices based on B/S.
jog on
duc