YOU SAID:
I could 100 percent this song
INTO JAPANESE
私はこの歌を100パーセントすることができました
BACK INTO ENGLISH
i was able to do this song 100%
INTO JAPANESE
この曲は100%できました
BACK INTO ENGLISH
This song is 100% done
INTO JAPANESE
この曲は 100% 完成しました
BACK INTO ENGLISH
This song is 100% complete
INTO JAPANESE
この曲は完成度100%
BACK INTO ENGLISH
This song is 100% complete
You've done this before, haven't you.