Oh... Well... Because it's good business.
6 seconds sound clip from the White Christmas (1954) movie soundboard.
You can hear this line at 00:20:02 in the Blu-ray version of the movie.
Quote context
[...]
- Judy, did you read Mother's letter this morning?
- No. Why?
- Benny's got a job in Alaska. He's been out of the country for three months.
- Oh? Oh... Well, he could have written from Alaska.
- Judy, why did you write the letter?
- Oh... Well... Because it's good business.
- Next time, will you talk to me first before you push us and plus us right out of show business?
- You needn't sound so patronizing. You sound just like a mother hen looking after a little chick.
- All right, girls, five minutes.
[...]