It all depends on the contract avex gives her, how many shows she does for her tour every year, and the number of CMs etc. So I'm guessing it varies every year.
I think in 2004 she paid like 300 million yen in taxes or something, so I think for '04 she earned at least 600 million yen....
And yeah, whatever Ayu makes, I don't think it's close to what Hikki makes.
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