are these sentences correct?

[Unregistered]

1) How does the supermarket sell their fruit? by weigth or by unit?
2) How is the vegetables and fruit sold?

[engee30]

1) How does the supermarket sell their fruit? By the weight or by the piece? By weight and by piece/per piece are also found
2) How are the vegetables and fruit sold?

[rachelnecati]

by weight or unit is correct

[David L.]

Brit. Eng.

How does the supermarket sell its fruit? Singly or by the pound/(kilo)?

2) How are the fruit and vegetables sold?
(Note the order, of 'fruit' before 'vegetables')

[engee30]

Brit. Eng.

How does the supermarket sell its fruit? Singly or by the pound/(kilo)?

Oops, I never spotted that. While reading it, I must have been affected by the elision, supermarketsell.

2) How are the fruit and vegetables sold?
(Note the order, of 'fruit' before 'vegetables')

Why the?