Since you apparently thought there was something wrong with the original figures presented, just some math:Just some math first:
+ 100% = double damage
+ 200% = triple damage
+100% = 200% = double damage.
If your damage number is 25, 25 + 100% = 50, 25 * 200% = 50.
+200% = 300% = triple damage.
If your damage number is 25, 25 + 200% = 75, 25 * 300% = 75.
Not quite sure what you were correcting, but both figures are correct.