It's 30 percent off. 30%세일이다.
The price was recently marked down. 가격이 인하 되었습니다.

How much do I owe you? 얼마입니까?
That's a good buy(good deal, real bargain)! 싸게 사셨군요.

That's a steal .공짜나 다름없군요.
That's a rip off !바가지 쓰셨군요.

I'm 3 dollar's short. 3달러 부족합니다.
alumni meeting 동창회

We have a lot in common.우린 공통점이 많아.
arrianged marriage 중매 결혼

I'd like to open an account. 계좌를 개설하고 싶어요.
bankbook 통장

I heard it through the grape vine. 소문을 통해 들었다.
Just leave it there. 그냥 놔 두세요.
I'm all thumb. 잘못해요.