Are you 100% certain that it has declined ろっぴゃく before? I've never noticed it happen once.
Now for a fun, interesting statistics post (because I haven't done one for a while)... These stats are taken from performing searches on a Japanese dictionary software I have, and how many words it found containing each of these:
*っは* (hha) = 11 (1)
*っば* (bba) = 1
*っぱ* (ppa) = 586
*っひ* (hhi) = 4
*っび* (bbi) = 1
*っぴ* (ppi) = 208
*っふ* (hhu/ffu) = 85
*っぶ* (bbu) = 17
*っぷ* (ppu) = 989
*っへ* (hhe) = 4
*っべ* (bbe) = 1
*っぺ* (ppe) = 98
*っほ* (hho) = 5 (1)
*っぼ* (bbo) = 1
*っぽ* (ppo) = 344
Basically, only っ+p occurs in proper Japanese vocabulary written in hiragana/kanji, which is why these numbers are so much higher than the others.
The only reason there are ANY っ+h and っ+b results is because all of these words are FOREIGN origin words (mostly English) spelt in katakana! (there were only one or two words which were very minor exceptions to this rule, which were alternative spellings).
So if you knew that rule, you'd know that the answer is impossible to be ろっびゃく, even without ever needing to have learnt that word before! ;-)
April 12, 2015 at 12:47pm
the correct answer is roppyaku
Ah, because most of the time it declines roppyaku.. E.e sorry.
Are you 100% certain that it has declined ろっぴゃく before? I've never noticed it happen once.