Ephron meant that since he and Abraham were both so wealthy, 400 pieces of silver was a small amount. This rhetorical question can be translated as a statement. Alternate translation: "The piece of land is worth only four hundred shekels of silver. For you and me, that is nothing." (See: [[rc://en/ta/man/translate/figs-rquestion]])
The nominal adjective "dead" can be stated as a verb or simply as "wife." Alternate translation: "Go bury your wife who has died" or "Go bury your wife" (See: [[rc://en/ta/man/translate/figs-nominaladj]])