我想問 " 3千2百50萬 " 點樣寫? 唔該

You should write it as :
Thirty-Two Million and Five Hundred Thousand because :

In numeric format, it is written as 32,500,000

The first comma (from left to right) indicates the million, while the second comma indicates the thousand.

So, if you view it as two separate parts, it will be composed of :

Thirty-Two million, plus, five hundred thousand.

It's so easy to remember the rules.

Thirty Two Million and Five Hundred Thousand

three thousand two hundred fifty million

three thousand two hundred fifty lac

thirty two million and five hundred thousand

three hundred and twenty-five million