I won new eed, what next?

I won a remand at CAVC for reconsideration of an earlier effective date back to 1988 due to missing records on a single issue, where the BVA judge agreed and granted it along with service connection. The RO just sent out a decision packet, which I’m still waiting on.

What rating percent will they use (I’m at 40% now, the MEB gave me 10% back then in 1988)? How will they calculate retropay (using todays dollars or 80’s pay)? Could I get IU (I was given P&T 100% in 2017) back to the new date (my social security record shows I only made above poverty level in 3 out of 30yrs of working)? Thx