Below I have added my solution after the question so please let me know how I can solve it after the last step:
These steps to follow to solve the question from where i left in my post ,
FYI :As the registance values are in killo ohm so current will be in mill amp and power will be milli watt .
Thanks a lot to @g36, @jasen and @rabi for your help . i learned something new today and its really going to help me in solving circuits easily.