You can calculate your share/amount of blacknet as follow:

((( <> * 1.<>) / <>) * 1e9

OR, same formula

(( <> / <>) * 1e9

WHERE:

YOUR BLK BURN = Amount of BLK burned by you
BONUS% = Bonus percentage active at moment of burn
TOTAL BLK BURNED = Total amount of accepted BLK burns by everyone

Because TOTAL BLK BURNED changes constantly, total amount of blacknet you get will be different