價錢呢就係20蚊一位嘅
That's $20 each.

Cantonese Sentence Breakdown

價錢 gaai3 cin2
price
ni1
this
就係 zau6 hai6
it is; exactly
man4
mosquito
gnat
dollar
ten thousand
ten thousand bucks
jat1
one
single
a (article)
as soon as
entire
whole
all
throughout
"one" radical in Chinese characters (Kangxi radical 1)
also pr. [yāo] for greater clarity when spelling out numbers digit by digit
first (positional)
one part of a fraction, such as 'a' quarter, an eighth
a short duration (when used with a verb)
each
same
dedicated
from the start
wai6
position
location
place
seat
classifier for people (honorific)
classifier for binary bits (e.g. 十六位 16-bit or 2 bytes)
throne
post
rank
status
koi3
indignant
generous
to sigh (with emotion)