On October $15,2023,$ the board of directors of Martinez Materials Corporation approved a stock option plan for key executives. On January $1,2024,21$ million stock options were granted, exercisable for $21$ million shares of Martinez's $$1$ par common stock.

$$The options are exercisable between January $1,2027,$ and December $31,2029,$ at $90\%$ of the quoted market price on January $1,2024,$ which was $$1$

$$The fair value of the $21$ million options, estimated by an appropriate option pricing model, is $$4$ per option.

$$Martinez chooses the option to recognize forfeitures only when they occur.

$$Ten percent $(2\mathrm{.}1$ million$)$ of the options were forfeited when an executive resigned in $2025.$

$$Fifty percent of the all other options were exercised on July $12,2028,$ when the stock's price jumped unexpectedly to $$20$ per share.

Required: Write in $ million.

$1-3.$ Determine the compensation expense for the stock option plan in $2024,2025$ and $2026.($Ignore taxes.$)$

$$Determine the cash Martinez receive on the date of option exercise.

$$Determine the paid$-$in$-$capital in excess of par on the date of option exercise.