How to say “Saturday was ten thousand yen, so it's been decided we'll rent the car on Friday. It's five thousand yen.” in Japanese
In Japanese
土曜日は一万円でしたから、車は金曜日に借りることになりました。五千円です。
Doyōbi wa ichiman en deshita kara, kuruma wa kin'yōbi ni kariru koto ni narimashita. Gosen en desu.