200 should be allowed as answer I feel
In my opinion that would not be correct because you have the fully written number. Therefore the correct translation is also a written number.
It accepts the '2' but not the '00' - and for the other numbers it accepts the numerical form. So your opinion is fine.... but either completely or not at all, not a mixture :)
I completely agree. "2" is recognized, "20" is recognized, "200" should be also.
Is it so that in normal speech it sounds like "doo sute"? I don't hear any "ua")