YOU SAID:

But how much does it cost how much does it cost

INTO JAPANESE

でも、いくらかかるんだろう、いくらかかるんだろう

BACK INTO ENGLISH

But how much will it cost, how much will it cost?

INTO JAPANESE

しかし、どれくらいの費用がかかりますか？

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But at what cost?

INTO JAPANESE

しかし、どのくらいの費用がかかるのでしょうか？

BACK INTO ENGLISH

But at what cost?