Potatoes are two yuan each ____ and there are four.中间应该填什么?

Potatoes are two yuan each ____ and there are four.中间应该填什么?
Potatoes are two yuan each ____ and there are four.中间应该填什么?

Potatoes are two yuan each ____ and there are four.中间应该填什么?
one

pack

bag

kilo
每斤两元，然后要买4个