help for solution

Here i m attaching ans to some of the quest. as per my view.  I am not giving details, just doing calculation part as it will be time consuming, if you want explaination of any point then do tell.

I m not in touch with cash flows since long time hence not attempting it.  May be some other member can solve  them.  If i hv solved any quest. wrongly then plz point out.

Ok got marginal/absprtn too.  Here is modified sol

Thanks for ur valuable solution...