I got confuse by the calculation of credit collected.
Lets say today MSFT trading at 20$ and i sold strangle at 15 put and 25 call for 2.00$ credit and the breakeven is 13 put, 27 call.
MSFT move down from 20$ to 14$ and its 1$ ITM of short put.
here is the question, i roll down the call side...