Actually, that formula reduces to something much easier:

For every $10,000,000 ($10M) in future total MMP licenses/royalties, a PTSC share would be worth 1 cent if you use my assumptions (which still need a better look at tax and interest implications).

$800,000,000 = 80x10,000,000 => 80c per share

$500,000,000 = 50x10,000,000 => 50c per share

It'd be nice if Google were to buy PTSC at $1 a share.... or even 75c.