Jesus is talking to a group of people about what they as individuals should and should not do. All instances of "you" and "your" are plural. (See: [[rc://en/ta/man/translate/figs-you]])
This rhetorical question can be translated as a statement. Alternative translation: "you will get no reward." (See: [[rc://en/ta/man/translate/figs-rquestion]])
This rhetorical question can be translated as a statement. Alternative translation: "Even the tax collectors do the same thing." (See: [[rc://en/ta/man/translate/figs-rquestion]])