YOU SAID:

It cost an arm and a leg.

INTO JAPANESE

それは腕と脚の費用がかかりました。

BACK INTO ENGLISH

It cost arms and legs.

INTO JAPANESE

それは腕と脚の費用がかかります。

BACK INTO ENGLISH

It costs arms and legs.

INTO JAPANESE

それは腕と足の費用がかかります。

BACK INTO ENGLISH

It costs arms and legs.