How much would it cost to charter a yacht for her fortieth?

How to say “How much would it cost to charter a yacht for her fortieth?” in Japanese

In Japanese

彼女の四十歳の誕生日(かのじょのよんじゅっさいのたんじょうび)にクルーザーをチャーターすると、いくらかかるんだろう。

Kanojo no yonjussai no tanjōbi ni kurūzā o chātā suru to, ikura kakaru n darō.

How much would it cost to charter a yacht for her fortieth? in other languages