The extra coins given because of donation rank is given AFTER the donation. So as exalted you get an extra 11 coins, which should bring the $100 dono to 129 coins.
Then Omegacoww is correct. Using a new account against my exalted account the donation rate and coins are the same. Seems to be an issue for outside the forums now. Will be contacting staff.
Ok, I was correct the first time. This is straight from GM Smyth.
Donation Rank bonuses are applied after a transaction and not shown within the Coin amounts of the donation widget.
Bonuses are also only applied to the base value of a transaction. For example, if you were to donate 30 Euro you would receive:
30 base Coins + 10% = 33 Coins
+ 3 Bonus Coins
= 36 Coins total
0.1-0.4 is rounded down and 0.5-0.9 is rounded up to the nearest whole number.