How to pronounce 兌 in Cantonese (7 out of 9):

用100yen港幣7元計算,
It's seven yuan in 100 yen.

Cantonese Sentence Breakdown

jung6
to use
to employ
to have to
to eat or drink
expense or outlay
usefulness
hence
therefore
to apply
to operate
function
to spend
to make use
to serve as
to eat
to drink
with
to need
to exert
effect
with this
jeoi6
alternative form for 銳, sharp
港幣 gong2 bai6
Hong Kong dollars
jyun4
unit of money (in PRC: Chinese yuan, in USA: dollar, etc)
primary
the first
origin
head
eldest
the Yuan Dynasty
a surname
計算 gai3 syun3
calculate