A 3-for-1 stock split means that the number of shares is multiplied by 3,
and becomes 900 shares.
Cost of one share before split: 23,000/900=$78
Cost of one share after split: 23,000/900=$26
Cost of 100 shares before split:78*100=7800
Cost of 100 shares after split:26*100=2600
The above sale result in loss of: 7800-2600=$5200