Hi Anil,
"2. Alternatively we are thinking of using BADI to read backend member formula table and write calculations in other base member. I am not able to identify in which table member formula is store. Appreciate if anyone know it."...
Why are you going for Badi .... If you want your result should be posted in other Base member then make use of EPMSavedata .. In a report where you are seeing the result.
But it is not possible to post your result to Database on the fly like Member formula without Script logic...
Even if you go for Badi also i think it will not calculate on the fly you need some triggering point to trigger this Badi...
Aravind