Quiz – Siman 114

What's better: for one to destroy all one's chametz, or to sell it to a goy?

If a tenant of an apartment would like to sell his chametz to a goy by renting a part of his apartment "for the goy to use for general storage", should the tenant ask permission from his landlord (who lives next door)?

May one arrange to sell  his cow to a goyover pesach so that the goy can feed it chametz?