In a 2 for 1 stock split, par value and market value will be 1/2 of what they were prior to the split and number of shares will be two times what it was.
So,
par value will be 6 x 0.5 = $ 3.00
market value will be 25 x 0.5 = $ 12.50
number of shares 8,000 x 2 will be 16,000 shares