> if a company makes a profit of $100, they'd have to pay $21 in tax, and the company's equity gain is then $79. If you then charge a 35% tax on top of the $79, then that means you've taxed the $100 profit at 56%, which is a lot higher than the normal amount. So by reducing capital gains tax to 15%, you'd end up charging only 36% in total.

35% of $79 is $27.65. Total tax according to your example would be $21 + $27.65 = $48.65.

They were being a bit pedantic, but their math is correct.