A: l've got to spend less otherwise I might end up eating instant noodles for the latter half of this month.

A：我必須得少花點錢了,否則下半個月就只能吃泡面了。
B: You can do what Jenny does. She keeps track of every penny. So it reminds you how much you have spent.
B：你可以學珍妮的做法。她記下自已的毎筆收入和支出。這樣就可以提醒自己花了多少餞了。

A: I can't believe she keeps track of every penny.

A: 不敢相信她記下自己的每筆收入和支出
B: Well, I think it's a good way to know where all your money went at the end of the month.
B: 我認為這是個不錯的方法.每個月都能知道自己把錢花在哪些地方了。

重點講解：

She records her every income and expense.
She keeps track of every penny.
記賬是節省開支的好方法。She records her every income and expense.表示 "她記下自己的每筆收入和支出。"其中income表示"收入"，expense表示 "花費"，但是老外在口語中有更簡潔的說法，即，She keeps track of every penny.短語keep track of表示"記錄"。