To prepare the journal entry to record the issuance of the shares. Costs being reduce by the stock issue is the amount that is otherwise recorded as PIC in excess of par. Therefore
Cash 424
Common stock (15 million x $1) 15
PIC in excess of par(Plug) 409
(to record the sale of the stock)
PIC in excess of par 2
(to record the stock issue costs)
Note: These two entries can also be combined as one.